Online Education for RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself

Online Education for RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself

These Solutions are part of Online Education RS Aggarwal Solutions Class 10. Here we have given RS Aggarwal Solutions Class 10 Chapter 10 Quadratic Equations Test Yourself.

Other Exercises

Objective Questions (MCQ)
Question 1.
Solution:
(a) x² – 3√x + 2 = 0
It is not a quadratic equation, it has a fractional power of √x
(b) x + \(\frac { 1 }{ x }\) = x²
⇒ x² + 1 = x3
It is not a quadratic equation.
(c) x² + \(\frac { 1 }{ { x }^{ 2 } }\) = 5
⇒ x4 + 1 + 5x²
It is not a quadratic equation.
(d) 2x² – 5x = (x – 1)²
⇒ 2x² – 5x = x² – 2x + 1
⇒ x² – 3x – 1 = 0
It is a quadratic equation. (d)

Question 2.
Solution:
(a) (x² + 1) = (2 – x)² + 3
⇒ x² + 1 = 4 + x² – 4x + 3 is not a quadratic equation.
(b) x3 – x² = (x – 1)3
⇒ x3 – x² = x3 – 3x² + 3x – 1
⇒ 3x² – x² – 3x + 1 = 0
⇒ 2x² – 3x + 1 = 0
It is a quadratic equation.
(c) 2x² + 3 = 10x – 15 + 2x² – 3x
⇒ 3x – 15 – 3 = 0
It is not a quadratic equation. (b)

Question 3.
Solution:
(a) It is a quadratic equation.
(b) (x + 2)² = 2(x² – 5)
⇒ x² + 4x + 4 = 2x² – 10
⇒ x² – 4x – 14 = 0
It is a quadratic equation.
(c) (√2 x + 3)² = 2x² + 6
⇒ 2x² + 3√2 x + 9 = 2x² + 6
⇒ 3√2 + 3 = 0
It is not a quadratic equation.
(d) (x – 1)² = 3x² + x – 2
⇒ x² – 2x +1 = 3x² + x – 2
⇒ 2x² + 3x – 3 = 0
It is a quadratic equation. (c)

Question 4.
Solution:
x = 3 is solution of 3x² + (k – 1)x + 9 = 0
It will satisfy it
3(3)² + (k – 1)(3) + 9 = 0
⇒ 27 + 3k – 3 + 9 = 0
⇒ 3k + 33 = 0
⇒ k = -11 (b)

Question 5.
Solution:
2 is one root of equation 2x² + ax + 6 = 0
It will satisfy it
2(2)² + a(2) + 6 = 0
⇒ 8 + 2a + 6 = 0
⇒ 2a = -14
⇒ a = -7
a = -7 (b)

Question 6.
Solution:
In equation x² – 6x + 2 = 0
Sum of roots = \(\frac { -b }{ a }\) = \(\frac { -(-6) }{ 1 }\) = 6 (c)

Question 7.
Solution:
In equation x² – 3x + k = 10
x² – 3x + (k – 10) = 0
Product of roots = \(\frac { c }{ a }\) = \(\frac { k – 10 }{ 1 }\) = k – 10
k – 10 = -2 then k = 10 – 2 = 8 (c)

Question 8.
Solution:
In equation 7x² – 12x + 18 = 0
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 1

Question 9.
Solution:
In equation 3x² – 10x + 3 = 0
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 2

Question 10.
Solution:
In equation 5x² + 13x + k = 0
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 3

Question 11.
Solution:
In equation kx² + 2x + 3k = 0
Sum of roots = \(\frac { -b }{ a }\) = \(\frac { -2 }{ k }\)
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 4

Question 12.
Solution:
Roots of an equation are 5, -2
Sum of roots (S) = 5 – 2 = 3
and product (P) = 5 x (-2) = -10
Equation will be
x² – (S)x + (P) = 0
⇒ x² – 3x – 10 = 0 (b)

Question 13.
Solution:
Sum of roots (S) = 6
Product of roots (P) = 6
Equation will be x² – (S)x + (P) = 0
x² – 6x + 6 = 0 (a)

Question 14.
Solution:
α and β are the roots of the equation 3x² + 8x + 2 = 0
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 5
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 6

Question 15.
Solution:
In equation ax² + bx + c = 0
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 7

Question 16.
Solution:
In equation ax² + bx + c = 0
Let α and β are the roots, then
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 8

Question 17.
Solution:
In equation 9x² + 6kx + 4 = 0, roots are equal
Let roots be α, α then
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 9

Question 18.
Solution:
In equation x² + 2 (k + 2) x + 9k = 0
Roots are equal
Let α, α be the roots, then
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 10

Question 19.
Solution:
In the equation
4x² – 3kx + 1 = 0 roots are equal
Let α, α be the roots
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 11

Question 20.
Solution:
Roots of ax² + bx + c = 0, a ≠ 0 are real and unequal if D > 0
⇒ b² – 4ac > 0 (a)

Question 21.
Solution:
In the equation ax² + bx + c = 0
D = b² – 4ac > 0, then roots are real and unequal. (b)

Question 22.
Solution:
In the equation 2x² – 6x + 7 = 0
D = b² – 4ac = (-6)² – 4 x 2 x 7 = 36 – 56 = -20 < 0
Roots are imaginary (not real) (d)

Question 23.
Solution:
In equation 2x² – 6x + 3 = 0
D = b² – 4ac = (-6)² – 4 x 2 x 3 = 36 – 24 = 12 > 0
Roots are real, unequal and irrational, (b)

Question 24.
Solution:
In equation 5x² – kx + 1 = 0
D = b² – 4ac = (-k)² – 4 x 5 x 1 = k² – 20
Roots are real and distinct
D > 0
⇒ k² – 20 > 0
⇒ k² > 20
⇒ k > √±20
⇒ k > ±2√5
⇒ k > 2√5 or k < -2√5 (d)

Question 25.
Solution:
In equation x² + 5kx + 16 = 0
D = b² – 4ac = (5k)² – 4 x 1 x 16
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 12

Question 26.
Solution:
The equation x² – kx + 1 = 0
D = b2 – 4ac = (-k)² – 4 x 1 x 1 ⇒ k² – 4
Roots are not real
D < 0
⇒ k² – 4 < 0
⇒ k² < 4
⇒k < (±2)²
⇒ k < ±2
-2 < k < 2 (c)

Question 27.
Solution:
In the equation kx² – 6x – 2 = 0
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 13

Question 28.
Solution:
Let the number be = x
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 14

Question 29.
Solution:
Perimeter of a rectangle = 82 m
and Area = 400
Let breadth (b) = x, then
Length = \(\frac { P }{ 2 }\) – x = \(\frac { 82 }{ 2 }\) – x = 41 – x
Area = lb
400 = x (41 – x) = 41x – x²
⇒ x² – 41x + 400 = 0
⇒ x² – 25x – 16x + 400 = 0
⇒ x (x – 25) – 16(x – 25) = 0
⇒ (x – 25) (x – 16) = 0
Either, x – 16 = 0, then x = 16
or x – 25 = 0, then x = 25
Breadth = 16 m (c)

Question 30.
Solution:
Let breadth of a rectangular field = x m
Then length = (x + 8) m
and area = 240 m²
x (x + 8) = 240
⇒ x² + 8x – 240 = 0
⇒ x² + 20x – 12x – 240 = 0
⇒ x (x + 20) – 12 (x + 20) = 0
⇒ (x + 20) (x – 12) = 0
Either, x + 20 = 0, then x = -20 which is not possible being negative,
or x – 12 = 0, then x = 12
Breadth = 12 m (c)

Question 31.
Solution:
2x² – x – 6 = 0
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 15

Very-Short-Answer Questions
Question 32.
Solution:
Sum of two natural numbers = 8
Let first number – x
Then second number = 8 – x
According to the condition,
x (8 – x) = 15
⇒ 8x – x² = 15
⇒ x² – 8x + 15 = 0
⇒ x² – 3x – 5x + 15 = 0
⇒ x(x – 3) – 5(x – 3) = 0
⇒ (x – 3)(x – 5) = 0
Either, x – 3 = 0, then x = 3
or x – 5 = 0, then x = 5
Natural numbers are 3, 5

Question 33.
Solution:
x = -3 is a solution of equation x² + 6x + 9 = 0 Then it will satisfy it
LHS = x² + 6x + 9 = (-3)² + 6(-3) + 9 = 9 – 18 + 9 = 0 = RHS

Question 34.
Solution:
3x² + 13x + 14 = 0
If x = -2 is its root then it will satisfy it
LHS = 3(-2)² + 13(-2) + 14 = 3 x 4 – 26 + 14 = 12 – 26 + 14 = 26 – 26 = 0 = RHS

Question 35.
Solution:
x = y is a solution of equation 3x² + 2kx – 3 = 0, then it will satisfy it
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 16
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 17

Question 36.
Solution:
2x² – x – 6 = 0
⇒ 2x² – 4x + 3x – 6 = 0
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 18

Question 37.
Solution:
3√3 x² + 10x + √3 = 0
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 19
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 20

Question 38.
Solution:
Roots of the quadratic equation 2x² + 8x + k = 0 are equal
Let α, α be its roots, then
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 21

Question 39.
Solution:
px² – 2√5 px + 15 = 0
Here, a = p, b = 2√5 p, c = 15
D = b² – 4ac = (-2√5 p)² – 4 x p x 15 = 20p² – 60p
Roots are equal.
D = 0
⇒ 20p² – 60p = 0
⇒ p² – 3p = 0
⇒ p (p – 3) = 0
p – 3 = 0, then p = 3

Question 40.
Solution:
1 is a root of equation
ay² + ay + 3 = 0 and y² + y + b = 0
Then a(1)² + a(1) + 3 = 0
⇒ a + a + 3 = 0
⇒ 2a + 3 = 0
⇒ a = \(\frac { -3 }{ 2 }\)
and 1 + 1 + b = 0
⇒ 2 + b = 0
⇒ b = -2
ab = \(\frac { -3 }{ 2 }\) x (-2) = 3
Hence, ab = 3

Question 41.
Solution:
The polynomial is x² – 4x + 1
Here, a = 1, b = -4, c = 1
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 22

Question 42.
Solution:
In the quadratic equation 3x² – 10x + k = 0
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 23

Question 43.
Solution:
The quadratic equation is
px (x – 2) + 6 = 0
⇒ px² – 2px + 6 = 0
D = b² – 4ac = (-2p)² – 4 x p x 6 = 4p² – 24p
Roots are equal
D = 0
Then 4p² – 24p = 0
⇒ 4p (p – 6) = 0
⇒ p – 6 = 0
⇒ p = 6

Question 44.
Solution:
x² – 4kx + k = 0
D = b² – 4ac = (-4k)² – 4 x 1 x k = 16k² – 4k
Roots are equal
D = 0
16k² – 4k = 0
⇒ 4k (4k – 1) = 0
⇒ 4k – 1 = 0
⇒ k = \(\frac { 1 }{ 4 }\)

Question 45.
Solution:
9x² – 3kx + k = 0
D = b² – 4ac = (-3k)² – 4 x 9 x k = 9k² – 36k
Roots are equal
D = 0
9k² – 36k = 0
9k (k – 4) = 0
Either, 9k = 0, then k = 0
or (k – 4) = 0 ⇒ k = 4
k = 0, 4

Short-Answer Questions
Question 46.
Solution:
x² – (√3 + 1) x + √3 = 0
D = b² – 4ac
= [-(√3 + 1)]² – 4 x 1 x √3
= 3 + 1 + 2√3 – 4√3
= 4 + 2√3 – 4√3
= 4 – 2√3
= 3 + 1 – 2√3
= (√3 – 1)²
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 24

Question 47.
Solution:
2x² + ax – a² = 0
D = B² – 4AC = a² – 4 x 2(-a)² = a² + 8a² = 9a²
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 25

Question 48.
Solution:
3x² + 5√5 x – 10 = 0
D = b² – 4ac = (5√5)² – 4 x 3 x (-10)
= 125 + 120 = 245 = 49 x 5 = (7√5)²
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 26
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 27

Question 49.
Solution:
√3 x² + 10x – 8√3 = 0
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 28

Question 50.
Solution:
√3 x² – 2√2 x – 2√3 = 0
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 29
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 30

Question 51.
Solution:
4√3 x² + 5x – 2√3 = 0
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 31
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 32

Question 52.
Solution:
4x² + 4bx – (a² – b²) = 0
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 33

Question 53.
Solution:
x² + 5x – (a² + a – 6) = 0
a² + a – 6 = a² + 3a – 2a – 6 = a(a + 3) – 2(a + 3) = (a + 3)(a – 2)
and 6 = (a + 3) – (a – 2)
x² + (a + 3)x – (a – 2)x – (a + 3) (a – 2) = 0
x (x + a + 3) – (a – 2) (x + a + 3) = 0
(x + a + 3)(x – a + 2) = 0
Either, x + a + 3 = 0, then x = -(a + 3)
or x – a + 2 = -0 then x = (a – 2)
x = -(a + 3) or (a – 2)

Question 54.
Solution:
x² + 6x – (a² + 2a – 8) = 0
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 34
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Test Yourself 35

Question 55.
Solution:
x² – 4ax + 4a² – b² = 0
4a² – b² = (2a)² – (b)² = (2a + b)(2a – b) – 4ax = (2a + b)x + (2a – b)x
x² – 4ax + 4a² – b² = x² – (2a + b)x – (2a – b)x + (2a + b)(2a – b) = 0
⇒ x (x – 2a – b) – (2a – b)(x – 2a – b) = 0
⇒ (x – 2a – b)(x – 2a + b)
Either, x – 2a – b = 0, then x = 2a + b
or x – 2a + b = 0, then x = 2a – b
Hence, x = (2a + b) or (2a – b)

Hope given RS Aggarwal Solutions Class 10 Chapter 10 Quadratic Equations Test Yourself are helpful to complete your math homework.

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RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A

NCERT Maths Solutions for Ex 4.1 class 10 Quadratic Equations is the perfect guide to boost up your preparation during CBSE 10th Class Maths Examination.

RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A

These Solutions are part of RS Aggarwal Solutions Class 10. Here we have given RS Aggarwal Solutions Class 10 Chapter 10 Quadratic Equations Ex 10A.

Other Exercises

Question 1.
Solution:
We know that a second degree of equation is called a quadratic equation. Therefore,
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 1
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 2
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 3
It is not a quadratic equation. It is of degree 5.
So, (i), (ii), (iii), (iv), (vi) and (ix) are quadratic equations.

Question 2.
Solution:
3x² + 2x – 1
= 3x² + 3x – x – 1
= 3x (x + 1) – 1 (x + 1)
= (x + 1) (3x – 1)
Either, x + 1 = 0 ⇒ x = -1
or 3x – 1 =0
⇒ 3x = 1
⇒ x = \(\frac { 1 }{ 3 }\)
Hence, (-1) and \(\frac { 1 }{ 3 }\) are its roots.

Question 3.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 4
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 5

Question 4.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 6
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 7

Solve each of the following quadratic equations.

Question 5.
Solution:
Given : (2x – 3)(3x + 1) = 0
Either 2x – 3 = 0, then 2x = 3 ⇒ x = \(\frac { 3 }{ 2 }\)
or 3x + 1 = 0, then 3x = -1 ⇒ x = \(\frac { -1 }{ 3 }\)
x = \(\frac { 3 }{ 2 }\) , \(\frac { -1 }{ 3 }\)

Question 6.
Solution:
4×2 + 5x = 0 ⇒ x (4x + 5) = 0
Either x = 0
or 4x + 5 = 0, then 4x = -5 ⇒ x = \(\frac { -5 }{ 4 }\)
x = \(\frac { -5 }{ 4 }\) or 0

Question 7.
Solution:
3x² – 243 = 0
x² – 81 =0 (Dividing by 3)
⇒ (x)² – (9)² = 0
⇒ (x + 9) (x – 9) = 0
Either, x + 9 = 0, then x = -9
or x – 9 = 0, then x = 9
Hence, x = 9 or -9

Question 8.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 8

Question 9.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 9

Question 10.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 10
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 11

Question 11.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 12

Question 12.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 13

Question 13.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 14
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 15

Question 14.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 16

Question 15.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 17

Question 16.
Solution:
4x² – 9x = 100
4x² – 9x – 100 = 0
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 18

Question 17.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 19

Question 18.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 20
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 21

Question 19.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 22

Question 20.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 23

Question 21.
Solution:
√3 x² + 10x + 7√3 = 0
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 24

Question 22.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 25

Question 23.
Solution:
3√7 x² + 4x + √7 = 0
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 26

Question 24.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 27
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 28

Question 25.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 29
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 30

Question 26.
Solution:
3x² – 2√6x + 2 = 0
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 31

Question 27.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 32

Question 28.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 33

Question 29.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 34

Question 30.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 35
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 36

Question 31.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 37

Question 32.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 38

Question 33.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 39

Question 34.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 40

Question 35.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 41

Question 36.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 42

Question 37.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 43

Question 38.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 44

Question 39.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 45

Question 40.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 46
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 47

Question 41.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 48

Question 42.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 49
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 50

Question 43.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 51

Question 44.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 52

Question 45.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 53

Question 46.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 54
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 55

Question 47.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 56

Question 48.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 57

Question 49.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 58
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 59

Question 50.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 60

Question 51.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 61

Question 52.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 62

Question 53.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 63

Question 54.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 64
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 65

Question 55.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 66
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 67
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 68

Question 56.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 69

Question 57.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 70
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 71

Question 58.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 72
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 73
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 74

Question 59.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 75
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 76
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 77
⇒ x = -2
Roots, x = -2

Question 60.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 78
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 79

Question 61.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 80

Question 62.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 81
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 82

Question 63.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 83
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 84

Question 64.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 85
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 86
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 87

Question 65.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 88
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 89

Question 66.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 90
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 91

Question 67.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 92
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 93

Question 68.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 94

Question 69.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 95
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 96

Question 70.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 97
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 98

Question 71.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 99

Question 72.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 100
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 101

Question 73.
Solution:
RS Aggarwal Class 10 Solutions Chapter 10 Quadratic Equations Ex 10A 102

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RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D

NCERT Maths Solutions for Chapter 3 Ex 3.4 Class 10 acts as the best resource during your learning and helps you score well in your board exams.

RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D

These Solutions are part of RS Aggarwal Solutions Class 10. Here we have given RS Aggarwal Solutions Class 10 Chapter 3 Linear equations in two variables Ex 3D. You must go through NCERT Solutions for Class 10 Maths to get better score in CBSE Board exams along with RS Aggarwal Class 10 Solutions.

RS Aggarwal Solutions Class 10 Chapter 3

Show that each of the following systems of equations has a unique solution and solve it:
Question 1.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 1

Question 2.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 2
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 3

Question 3.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 4
This system has a unique solution.
From (ii), x = 2 + 2y
Substituting the value of x in (i),
2(2 + 2y) + 3y = 18
=> 4 + 4y + 3y = 18
=> 7y = 18 – 4 = 14
=> y = 2
and x = 2 + 2 x 2 = 2 + 4 = 6
x = 6, y = 2

Find the value of k for which each of the following systems of equations has a unique solution:
Question 4.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 5

Question 5.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 6

Question 6.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 7

Question 7.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 8

Question 8.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 9

Question 9.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 10
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 11

Question 10.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 12

Question 11.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 13

Question 12.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 14

Question 13.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 15
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 16

Question 14.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 17

Find the value of k for which each of the following systems of linear equations has an infinite number of solutions:
Question 15.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 18

Question 16.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 19
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 20

Question 17.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 21

Question 18.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 22
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 23

Question 19.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 24
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 25

Question 20.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 26
=> k (k – 6) = 0
Either k = 0, which is not true, or k – 6 = 0, then k = 6
k = 6

Find the values of a and b for which each of the following systems of linear equations has an infinite number of solutions:
Question 21.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 27

Question 22.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 28
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 29

Question 23.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 30
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 31

Question 24.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 32
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 33

Question 25.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 34

Question 26.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 35

Find the value of k for which each of the following systems of equations has no solution:
Question 27.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 36

Question 28.
Solution:
kx + 3y = 3
12x + ky = 6
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 37

Question 29.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 38

Question 30.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 39
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 40

Question 31.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3D 41

Hope given RS Aggarwal Solutions Class 10 Chapter 3 Linear equations in two variables Ex 3D are helpful to complete your math homework.

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RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A

NCERT Maths Solutions for Ex 2.1 class 10 Polynomials is the perfect guide to boost up your preparation during CBSE 10th Class Maths Examination.

RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A

These Solutions are part of RS Aggarwal Solutions Class 10. Here we have given RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A

Other Exercises

Find the zeros of the following quadratic polynomials and verify the relationship between the zeros and the coefficients:
Question 1.
Solution:
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 1

Question 2.
Solution:
x² – 2x – 8
Let f(x) = x² – 2x – 8
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 2

Question 3.
Solution:
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 3

Question 4.
Solution:
4x² – 4x – 3
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 4
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 5

Question 5.
Solution:
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 6
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 7

Question 6.
Solution:
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 8
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 9
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 10

Question 7.
Solution:
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 11

Question 8.
Solution:
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 12
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 13

Question 9.
Solution:
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 14

Question 10.
Solution:
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 15
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 16

Question 11.
Solution:
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 17

Question 12.
Solution:
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 18

Question 13.
Solution:
Zeros of a quadratic polynomial are 2, -6
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 19

Question 14.
Solution:
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 20

Question 15.
Solution:
Sum of zeros = 8
Product of zeros = 12
Quadratic equation will be x² – (Sum of zeros) x + Product of zeros = 0
=> x² – 8x + 12 = 0
=> x² – 6x – 2x + 12 = 0
=> x (x – 6) – 2 (x – 6) = 0
=> (x – 6) (x – 2) = 0
Either x – 6 = 0, then x = 6
or x – 2 = 0, then x = 2
Zeros are 6, 2
and quadratic polynomial is x² – 8x + 12

Question 16.
Solution:
Sum of zeros = 0
and product of zeros = -1
Quadratic equation will be
x² – (Sum of zeros) x + Product of zeros = 0
=> x² – 0x – 1 = 0
=> x² – 1= 0
(x + 1)(x – 1) = 0
Either x + 1 = 0, then x = -1 or x – 1 =0, then x = 1
Zeros are 1, -1
and quadratic polynomial is x² – 1

Question 17.
Solution:
Sum of zeros = \(\frac { 5 }{ 2 }\)
Product of zeros = 1
Quadratic equation will be
x² – (Sum of zeros) x + Product of zeros = 0
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 21
and quadratic polynomial is 2x² – 5x + 2

Question 18.
Solution:
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 22

Question 19.
Solution:
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 23

Question 20.
Solution:
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 24

Question 21.
Solution:
One zero of the given polynomial is \(\frac { 2 }{ 3 }\)
RS Aggarwal Class 10 Solutions Chapter 2 Polynomials Ex 2A 25
=> (x + 3) (x + 3) = 0
x = -3, -3
Hence, other zeros are -3, -3

Hope given RS Aggarwal Solutions Class 10 Chapter 2 Polynomials Ex 2A are helpful to complete your math homework.

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RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B

Are you looking for the best Maths NCERT Solutions Chapter 3 Ex 3.2 Class 10? Then, grab them from our page and ace up your preparation for CBSE Class 10 Exams.

These Solutions are part of RS Aggarwal Solutions Class 10. Here we have given RS Aggarwal Solutions Class 10 Chapter 3 Linear equations in two variables Ex 3B. You must go through NCERT Solutions for Class 10 Maths to get better score in CBSE Board exams along with RS Aggarwal Class 10 Solutions.

RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B

Solve for x and y:
Question 1.
Solution:
x + y = 3 …..(i)
4x – 3y = 26 …(ii)
From (i), x = 3 – y
Substituting the value of x in (ii),
4(3 – y) – 3y = 26
=> 12 – 4y – 3y = 26
-7y = 26 – 12 = 14
y = -2
x = 3 – y = 3 – (-2) = 3 + 2 = 5
Hence, x = 5, y = -2

Question 2.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 1

Question 3.
Solution:
2x + 3y= 0 ……..(i)
3x + 4y = 5 …….(ii)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 2

Question 4.
Solution:
2x – 3y = 13 ……(i)
7x – 2y = 20 ……….(ii)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 3

Question 5.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 4
=> x = -2, y = -5

Question 6.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 5

Question 7.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 6

Question 8.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 7

Question 9.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 8
Hence, x = \(\frac { 3 }{ 2 }\) , y = \(\frac { -2 }{ 3 }\)

Question 10.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 9

Question 11.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 10
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 11

Question 12.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 12

Question 13.
Solution:
0.4x + 0.3y = 1.7
0.7x – 0.2y = 0.8
Multiplying each term by 10
4x + 3y = 17
0.7x – 2y = 8
Multiply (i) by 2 and (ii) by 3,
8x + 6y = 34
21x – 6y = 24
Adding, we get
29x = 58
x = 2
From (i) 4 x 2 + 3y = 17
=> 8 + 3y = 17
=> 3y = 17 – 8 = 9
y = 3
x = 2, y = 3

Question 14.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 13

Question 15.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 14
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 15

Question 16.
Solution:
6x + 5y = 7x + 3y + 1 = 2(x + 6y – 1)
6x + 5y = 7x + 3y + 1
=> 6x + 5y – 7x – 3y = 1
=> -x + 2y = 1
=> 2y – x = 1 …(i)
7x + 3y + 1 = 2(x + 6y – 1)
7x + 3y + 1 = 2x + 12y – 2
=> 7x + 3y – 2x – 12y = -2 – 1
=> 5x – 9y = -3 …..(ii)
From (i), x = 2y – 1
Substituting the value of x in (ii),
5(2y – 1) – 9y = -3
=> 10y – 5 – 9y = -3
=> y = -3 + 5
=> y = +2
x = 2y – 1 = 2 x 2 – 1 = 4 – 1 = 3
x = 3, y = 2

Question 17.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 16
and x = y – 4 = 6 – 4 = 2
x = 2, y = 6

Question 18.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 17

Question 19.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 18
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 19

Question 20.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 20
x = 3, y = -1

Question 21.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 21
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 22

Question 22.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 23
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 24

Question 23.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 25
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 26

Question 24.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 27
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 28

Question 25.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 29
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 30

Question 26.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 31
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 32

Question 27.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 33
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 34
x = 3, y = 2

Question 28.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 35
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 36

Question 29.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 37
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 38

Question 30.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 39
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 40

Question 31.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 41
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 42
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 43

Question 32.
Solution:
71x + 37y = 253
37x + 71y = 287
Adding, we get
108x + 108y = 540
x + y = 5 ………(i) (Dividing by 108)
and subtracting,
34x – 34y = -34
x – y = -1 ……..(ii) (Dividing by 34)
Adding, (i) and (ii)
2x = 4 => x = 2
and subtracting,
2y = 6 => y = 3
Hence, x = 2, y = 3

Question 33.
Solution:
217x + 131y = 913 …(i)
131x + 217y = 827 …..(ii)
Adding, we get
348x + 348y = 1740
x + 7 = 5 …..(iii) (Dividing by 348)
and subtracting,
86x – 86y = 86
x – y = 1 …(iv) (Dividing by 86)
Now, adding (iii) and (iv)
2x = 6 => x = 3
and subtracting,
2y = 4 => y = 2
x = 3, y = 2

Question 34.
Solution:
23x – 29y = 98 ……(i)
29x – 23y = 110 ……(ii)
Adding, we get
52x – 52y = 208
x – y = 4 ……(iii) (Dividing by 52)
and subtracting
-6x – 6y = -12
x + y = 2 …..(iv)
Adding (iii), (iv)
2x = 6 => x = 3
Subtracting (iii) from (iv)
2y = -2 => y = -1
x = 3, y = -1

Question 35.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 44
x = 1 and y = 2

Question 36.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 45
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 46

Question 37.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 47
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 48
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 49

Question 38.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 50
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 51

Question 39.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 52
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 53

Question 40.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 54

Question 41.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 55
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 56

Question 42.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 57

Question 43.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 58
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 59

Question 44.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 60
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 61
a = \(\frac { 1 }{ 2 }\) , b = \(\frac { 1 }{ 3 }\)

Question 45.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 62

Question 46.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 63

Question 47.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 64

Question 48.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 65

Question 49.
Solution:
a²x + b²y = c² ……(i)
b²x + a²y = d² …….(ii)
Multiply (i) by a² and (ii) by b²,
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 66
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 67

Question 50.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 68
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 69
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3B 70

Hope given RS Aggarwal Solutions Class 10 Chapter 3 Linear equations in two variables Ex 3B are helpful to complete your math homework.

If you have any doubts, please comment below. Learn Insta try to provide online math tutoring for you.

RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E

NCERT Maths Solutions for Ex 3.5 class 10 Linear equations is the perfect guide to boost up your preparation during CBSE 10th Class Maths Examination.

RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E

These Solutions are part of RS Aggarwal Solutions Class 10. Here we have given RS Aggarwal Solutions Class 10 Chapter 3 Linear equations in two variables Ex 3E. You must go through NCERT Solutions for Class 10 Maths to get better score in CBSE Board exams along with RS Aggarwal Class 10 Solutions.

Question 1.
Solution:
Let cost of one chair = ₹ x
and cost of one table = ₹ y
According to the conditions,
5x + 4y = ₹ 5600 …(i)
4x + 3y = ₹ 4340 …(ii)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 1

x = -560
and from (i)
5 x 560 + 4y = 5600
2800 + 4y = 5600
⇒ 4y = 5600 – 2800
⇒ 4y = 2800
⇒ y = 700
Cost of one chair = ₹ 560
and cost of one table = ₹ 700

Question 2.
Solution:
Let the cost of one spoon = ₹ x and cost of one fork = ₹ y
According to the conditions,
23x + 17y = 1770 …(i)
17x + 23y = 1830 …(ii)
Adding, we get
40x + 40y = 3600
Dividing by 40,
x + y = 90 …(iii)
and subtracting,
6x – 6y = -60
Dividing by 6,
x – y = -10 …(iv)
Adding (iii) and (iv)
2x = 80 ⇒ x = 40
and subtracting,
2y = 100 ⇒ y = 50
Cost of one spoon = ₹ 40
and cost of one fork = ₹ 50

Question 3.
Solution:
Let number of 25-paisa coins = x
and number 50-paisa coins = y
Total number of coins = 50
and total amount = ₹ 19.50 = 1950 paisa
x + y = 50 …(i)
25x + 50y = 1950
⇒ x + 2y = 78 …(ii)
Subtracting (i) from (ii), y = 28
x = 50 – y = 50 – 28 = 22
Number of 25-paisa coins = 22
and 50-paisa coins = 28

Question 4.
Solution:
Sum of two numbers = 137
and difference = 43
Let first number = x
and second number = y
x + y = 137 …..(i)
x – y = 43 ……(ii)
Adding, we get
2x = 180 ⇒ x = 90
and subtracting,
2y = 94
y = 47
First number = 90
and second number = 47

Question 5.
Solution:
Let first number = x
and second number = y
According to the conditions,
2x + 3y = 92 …(i)
4x – 7y = 2 …(ii)
Multiply (i) by 2 and (ii) by 1
4x + 6y = 184 …..(iii)
4x – 7y = 2 …….(iv)
Subtracting (iii) from (iv),
13y = 182
y = 14
From (i), 2x + 3y = 92
2x + 3 x 14 = 92
⇒ 2x + 42 = 92
⇒ 2x = 92 – 42 = 50
⇒ x = 25
First number = 25
Second number = 14

Question 6.
Solution:
Let first number = x
and second number = y
According to the conditions,
3x + y=142 …(i)
4x – y = 138 …(ii)
Adding, we get
7x = 280
⇒ x = 40
and from (i)
3 x 40 + y = 142
⇒ 120 + y = 142
⇒ y = 142 – 120 = 22
First number = 40,
second number = 22

Question 7.
Solution:
Let first greater number = x
and second smaller number = y
According to the conditions,
2x – 45 = y …(i)
2y – 21 = x …(ii)
Substituting the value of y in (ii),
2 (2x – 45) – 21 = x
⇒ 4x – 90 – 21 = x
⇒ 4x – x = 111
⇒ 3x = 111
⇒ x = 37
From (i),
y = 2 x 37 – 45 = 74 – 45 = 29
The numbers are 37, 29

Question 8.
Solution:
Let larger number = x
and smaller number = y
According to the conditions,
3x = 4 x y + 8 ⇒ 3x = 4y + 8 …….(i)
5y = x x 3 + 5 ⇒ 5y = 3x + 5 …(ii)
Substitute the value of 3x in (ii),
5y = 4y + 8 + 5
⇒ 5y – 4y = 13
⇒ y = 13
and 3x = 4 x 13 + 8 = 60
⇒ x = 20
Larger number = 20
and smaller number = 13

Question 9.
Solution:
Let first number = x and
second number = y
According to the conditions,
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 2
⇒ 11x – 44 = 5(2x + 2) – 20
⇒ 11x – 44 = 10x + 10 – 20
⇒ 11x – 10x = 10 – 20 + 44
⇒ x = 34
and y = 2 x 34 + 2 = 68 + 2 = 70
Numbers are 34 and 70

Question 10.
Solution:
Let first number = x
and second number (smaller) = y
According to the conditions,
x – y = 14
and x² – y² = 448
⇒ (x + y) (x – y) = 448
⇒ (x + y) x 14 = 448
⇒ x + y = 32 ……(i)
and x – y = 14 ……(ii)
Adding (i) and (ii),
2x = 46 ⇒ x = 23
and subtracting (i) and (ii),
2y = 18 ⇒ y = 9
Numbers are 23, 9

Question 11.
Solution:
Let ones digit of a two digit number = x
and tens digit = y
Number = x + 10y
By interchanging the digits,
Ones digit = y
and tens digit = x
Number = y + 10x
According to the conditions,
x + y = 12 ………. (i)
y + 10x = x + 10y + 18
⇒ y + 10x – x – 10y = 18
⇒ 9x – 9y = 18
⇒ x – y = 2 …(ii) (Dividing by 9)
Adding (i) and (ii),
2x = 14 ⇒ x = 7
and subtracting,
2y = 10 ⇒ y = 5
Number = 7 + 10 x 5 = 7 + 50 = 57

Question 12.
Solution:
Let one’s digit of a two digit number = x
and ten’s digit = y
Then number = x + 10y
After reversing the digits,
Ones digit = y
and ten’s digit = x
and number = y + 10x
According to the conditions,
x + 10y – 27 = y + 10x
⇒ y + 10x – x – 10y = -27
⇒ 9x – 9y = -27
⇒ x – y = -3 …(i)
and 7 (x + y) = x + 10y
7x + 7y = x+ 10y
⇒ 7x – x = 10y – 7y
⇒ 6x = 3y
⇒ 2x = y …(ii)
Substituting the value of y in (i)
x – 2x = -3
⇒ -x = -3
⇒ x = 3
y = 2x = 2 x 3 = 6
Number = x + 10y = 3 + 10 x 6 = 3 + 60 = 63

Question 13.
Solution:
Let one’s digit of a two digit number = x
and ten’s digit = y
Then number = x + 10y
After interchanging the digits,
One’s digit = y
and ten’s digit = x
Then number = y + 10x
According to the conditions,
y + 10x = x + 10y + 9
⇒ y + 10x – x – 10y = 9
⇒ 9x – 9y = 9
⇒ x – y = 1 …(i)
and x + y= 15 …(ii)
Adding, we get
2x = 16
x = 8
and subtracting,
2y = 14
⇒ y = 7
Number = x + 10y = 8 + 10 x 7 = 8 + 70 = 78

Question 14.
Solution:
Let one’s digit of the two digit number = x
and ten’s digit = y
Then number = x + 10y
By reversing the digits,
One’s digit = y
and ten’s digit = x
Then number = y + 10x
Now, according to the conditions,
x + 10y + 18 = y + 10x
⇒ 18 = y + 10x – x – 10y
⇒ 9x – 9y = 18
⇒ x – y = 2 …(i)
and 4(x + y) + 3 = x + 10y
4x + 4y + 3 = x + 10y
⇒ 4x + 4y – x – 10y = -3
3x – 6y = -3
⇒ x – 2y = -1 ……..(ii)
Subtracting,
y = 3
and x = 2y – 1 = 2 x 3 – 1 = 6 – 1 = 5
Number = x + 10y = 5 + 10 x 3 = 5 + 30 = 35

Question 15.
Solution:
Let ones digit of a two digit number = x
and tens digit = y
Then number = x + 10y
By reversing the digits,
One’s digit = y
and ten’s digit = x
and number = y + 10x
According to the conditions,
x + 10y – 9 = y + 10x
⇒ x + 10y – y – 10x = 9
⇒ -9x + 9y = 9
⇒x – y = -1 …(i) (Dividing by -9)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 3

Question 16.
Solution:
Let the one’s digit of a two digit number = x
and ten’s digit = y
Then number = x + 10y
By interchanging the digits,
One’s digit = y
and ten’s digit = x
Then number = y + 10x
According to the conditions,
x + 10y + 18 = y + 10x
⇒ 18 = y + 10x – x – 10y
⇒ 9x – 9y = 18
⇒ x – y = 2 …(i)
and xy = 35 …(ii)
Now, (x + y)² = (x – y)² + 4xy = (2)² + 4 x 35 = 4 + 140 = 144 = (12)²
⇒ (x + y) = 12 …(iii)
Subtracting (i) from (iii), we get
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 4

Question 17.
Solution:
Let one’s digit of a two digit number = x
and ten’s digit = y
Then number = x + 10y
After interchanging the digits One’s digit = y
Ten’s digit = x
Then number = y + 10x
According to the conditions,
x + 10y – 63 = y + 10x
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 5

Question 18.
Solution:
Let one’s digit of a two digit number = x
and ten’s digit = y
Number = x + 10y
By reversing the digits,
One’s digit = y
and ten’s digit = x
Number = y + 10x
According to the conditions,
x + 10y + y + 10x = 121
⇒ 11x + 11y = 121
⇒ x + y = 11 …(i)
x – y = 3 …(ii)
Adding, we get
2x = 14 ⇒ x = 7
Subtracting,
2y = 8 ⇒ y = 4
Number = 7 + 10 x 4 = 7 + 40 = 47
or 4 + 10 x 7 = 4 + 70 = 74

Question 19.
Solution:
Let numerator of a fraction = x
and denominator = y
Then fraction = \(\frac { x }{ y }\)
According to the conditions,
x + y = 8 …(i)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 6

Question 20.
Solution:
Let numerator of a fraction = x
and denominator = y
Then fraction = \(\frac { x }{ y }\)
According to the conditions,
\(\frac { x + 2 }{ y }\) = \(\frac { 1 }{ 2 }\)
\(\frac { x }{ y – 1 }\) = \(\frac { 1 }{ 3 }\)
⇒ 2x + 4 = y …(i)
3x = y – 1 …(ii)
⇒ 3x = 2x + 4 – 1
⇒ 3x = 2x + 3
⇒ 3x – 2x = 3
⇒ x = 3
and y = 2x + 4 = 2 x 3 + 4 = 6 + 4 = 10
Fraction = \(\frac { 3 }{ 10 }\)

Question 21.
Solution:
Let numerator of a fraction = x
and denominator = y
Then fraction = \(\frac { x }{ y }\)
According to the conditions,
y – x = 11
y = 11 + x …(i)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 7

Question 22.
Solution:
Let numerator of a fraction = x
and denominator = y
Then fraction = \(\frac { x }{ y }\)
According to the conditions,
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 8

Question 23.
Solution:
Let numerator of a fraction = x
and denominator = y
Then fraction =
According to the conditions,
x + y = 4 + 2x
⇒ y = 4 + x …(i)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 9
Fraction = \(\frac { x }{ y }\) = \(\frac { 5 }{ 9 }\)

Question 24.
Solution:
Let first number = x
and second number = y
According to the conditions,
x + y = 16
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 10

Question 25.
Solution:
Let in classroom A, the number of students = x
and in classroom B = y
According to the conditions,
x – 10 = y + 10
⇒ x – y = 10 + 10 = 20
⇒ x – y = 20 …(i)
and x + 20 = 2 (y – 20)
⇒ x + 20 = 2y – 40
⇒ x – 2y = -(40 + 20) = -60
x – 2y = -60 …(ii)
Subtracting, y = 80
and x – y = 20
⇒ x – 80 = 20
⇒ x = 20 + 80 = 100
Number of students in classroom A = 100 and in B = 80

Question 26.
Solution:
Let fixed charges = ₹ x
and other charges = ₹ y per km
According to the conditions,
For 80 km,
x + 80y = ₹ 1330 …(i)
and x + 90y = ₹ 1490 …(ii)
Subtracting (i) from (ii),
10y = 160 ⇒ y = 16
and from (i)
x + 80 x 16 = 1330
⇒ x + 1280 = 1330
⇒ x = 1330 – 1280 = 50
Fixed charges = ₹ 50
and rate per km = ₹ 16

Question 27.
Solution:
Let fixed charges of the hostel = ₹ x
and other charges per day = ₹ y
According to the conditions,
x + 25y = 4500 ……..(i)
x + 30y = 5200 ……(ii)
Subtracting (i) from (ii),
5y = 700
y = 140
and from (i),
x + 25 x 140 = 4500
⇒ x + 3500 = 4500
⇒ x = 4500 – 3500 = 1000
Fixed charges = ₹ 1000
and per day charges = ₹ 140

Question 28.
Solution:
Let first investment = ₹ x
and second investment = ₹ y
Rate of interest = 10% p.a. for first kind and 8% per second
Interest is for the first investment = ₹ 1350
and for the second = ₹ 1350 – ₹45 = ₹ 1305
According to the conditions,
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 11
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 12

Question 29.
Solution:
Ratio in the income of A and B = 5 : 4
Let A’s income = ₹ 5x and
B’s income = ₹ 4x
and ratio in their expenditures = 7 : 5
Let A’s expenditure = 7y
and B’s expenditure = 5y
According to the conditions,
5x – 7y = 9000 …(i)
and 4x – 5y = 9000 …(ii)
Multiply (i) by 5 and (ii) by 7,
25x – 35y = 45000
28x – 37y = 63000
Subtracting, we get
3x = 18000
⇒ x = 6000
A’s income = 5x = 5 x 6000 = ₹ 30000
and B’s income = 4x = 4 x 6000 = ₹ 24000

Question 30.
Solution:
Let cost of one chair = ₹ x
and cost of one table = ₹ y
In first case,
Profit on chair = 25%
and on table = 10%
and selling price = ₹ 1520
According to the conditions,
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 13

Question 31.
Solution:
Distance between two stations A and B = 70 km
Let speed of first car (starting from A) = x km/hr
and speed of second car = y km/hr
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 14
According to the conditions,
7x – 7y = 70
⇒ x – y = 10 …(i)
and x + y = 70 …(ii)
Adding (i) and (ii),
2x = 80 ⇒ x = 40
Subtracting (i) and (ii),
2y = 60 ⇒ y = 30
Speed of car A = 40 km/hr
and speed of car B = 30 km/hr

Question 32.
Solution:
Let uniform speed of the train = x km/hr
and time taken = y hours
Distance = x x y = xy km
Case I:
Speed = (x + 5) km/hr
and Time = (y – 3) hours
Distance = (x + 5) (y – 3)
(x + 5) (y – 3) = xy
⇒ xy – 3x + 5y – 15 = xy
-3x + 5y = 15 …(i)
Case II:
Speed = (x – 4) km/hr
and Time = (y + 3) hours
Distance = (x – 4) (y + 3)
(x – 4) (y + 3) = xy
⇒ xy + 3x – 4y – 12 = xy
3x – 4y = 12 …(ii)
Adding (i) and (ii),
y = 27
and from (i),
-3x + 5 x 27 = 15
⇒ -3x + 135 = 15
⇒ -3x = 15 – 135 = -120
⇒ x = 40
Speed of the train = 40 km/hr
and distance = 27 x 40 = 1080 km

Question 33.
Solution:
Let the speed of the train = x km/hr
and speed of taxi = y km/hr
According to the conditions,
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 15
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 16

Question 34.
Solution:
Distance between stations A and B = 160 km
Let the speed of the car starts from A = x km/hr
and speed of car starts from B = y km/hr
8x – 8y = 160
⇒ x – y = 20 …(i)
and 2x + 2y = 160
⇒ x + y = 80 …(ii)
Adding (i) and (ii)
2x = 100 ⇒ x = 50
and subtracting,
2y = 60 ⇒ y = 30
Speed of car starting from A = 50 km/hr
and from B = 30 km/hr

Question 35.
Solution:
Distance = 8 km
Let speed of sailor in still water = x km/hr
and speed of water = y km/hr
According to the conditions,
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 17
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 18

Question 36.
Solution:
Let speed of a boat = x km/hr
and speed of stream = y km/hr
According to the conditions,
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 19
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 20

Question 37.
Solution:
Let a man can do a work in x days
His 1 day’s work = \(\frac { 1 }{ x }\)
and a boy can do a work in y days
His 1 day’s work = \(\frac { 1 }{ y }\)
According to the conditions,
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 21
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 22

Question 38.
Solution:
Let length of a room = x m
and breadth = y m
and area = xy m²
According to the conditions,
x = y + 3 …(i)
(x + 3) (y – 2) = xy
xy – 2x + 3y – 6 = xy
-2x + 3y = 6 …(ii)
-2 (y + 3) + 3y = 6 [From (i)]
-2y – 6 + 3y = 6
⇒ y = 6 + 6 = 12
x = y + 3 = 12 + 3 = 15 …(ii)
Length of room = 15 m
and breadth = 12 m

Question 39.
Solution:
Let length of a rectangle = x m
and breadth = y m
Then area = x x y = xy m²
According to the conditions,
(x – 5) (y + 3) = xy – 8
⇒ xy + 3x – 5y – 15 = xy – 8
⇒ 3x – 5y = -8 + 15 = 7 …..(i)
and (x + 3) (y + 2) = xy + 74
⇒ xy + 2x + 3y + 6 = xy + 74
⇒ 2x + 3y = 74 – 6 = 68 …(ii)
Multiply (i) by 3 and (ii) by 5
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 23

Question 40.
Solution:
Let length of a rectangle = x m
and breadth = y m
Then area = xy m²
According to the conditions,
(x + 3) (y – 4) = xy – 67
⇒ xy – 4x + 3y – 12 = xy – 67
⇒ -4x + 3y = -67 + 12 = -55
⇒ 4x – 3y = 55 …(i)
and (x – 1) (y + 4) = xy + 89
⇒ xy + 4x – y – 4 = xy + 89
⇒ 4x – y = 89 + 4 = 93 ….(ii)
⇒ y = 4x – 93
Substituting the value of y in (i),
4x – 3(4x – 93) = 55
⇒ 4x – 12x + 279 = 55
⇒ -8x = 55 – 279 = -224
⇒ x = 28
and y = 4x – 93 = 4 x 28 – 93 = 112 – 93 = 19
Length of rectangle = 28 m
and breadth = 19 m

Question 41.
Solution:
Let reservation charges = ₹ x
and cost of full ticket from Mumbai to Delhi
According to the conditions,
x + y = 4150 …(i)
2x + \(\frac { 3 }{ 2 }\) y = 6255
⇒ 4x + 3y = 12510 …(ii)
From (i), x = 4150 – y
Substituting the value of x in (ii),
4 (4150 – y) + 3y = 12510
⇒ 16600 – 4y + 3y = 12510
-y = 12510 – 16600
-y = -4090
⇒ y = 4090
and x = 4150 – y = 4150 – 4090 = 60
Reservation charges = ₹ 60
and cost of 1 ticket = ₹ 4090

Question 42.
Solution:
Let present age of a man = x years
and age of a son = y years
5 year’s hence,
Man’s age = x + 5 years
and son’s age = y + 5 years
x + 5 = 3 (y + 5) = 3y + 15
⇒ x – 3y = 15 – 5 = 10
x = 10 + 3y …(i)
and 5 years ago,
Man’s age = x – 5 years
and son’s age = y – 5 years
x – 5 = 7 (y – 5) = 7y – 35
x = 7y – 35 + 5 = 7y – 30 …(ii)
From (i) and (ii),
10 + 3y = 7y – 30
⇒ 7y – 3y = 10 + 30
⇒ 4y = 40
⇒ y = 10
and x = 10 + 3y = 10 + 3 x 10 = 10 + 30 = 40
Present age of a man = 40 years
and of son’s age = 10 years

Question 43.
Solution:
Let present age of a man = x years
and age of his son = y years
2 years ago,
Man’s age = x – 2 years
Son’s age = y – 2 years
x – 2 = 5 (y – 2)
⇒ x – 2 = 5y – 10
x = 5y – 10 + 2 = 5y – 8 …(i)
2 years later,
Man’s age = x + 2 years
and son’s age = y + 2 years
x + 2 = 3(y + 2) + 8
x + 2 = 3y + 6 + 8
⇒ x = 3y + 6 + 8 – 2 = 3y + 12 …(ii)
From (i) and (ii),
5y – 8 = 3y + 12
⇒ 5y – 3y = 12 + 8
⇒ 2y = 20
⇒ y = 10
and x = 5y – 8 = 5 x 10 – 8 = 50 – 8 = 42
Present age of man = 42 years
and age of son = 10 years

Question 44.
Solution:
Let age of father = x years
and age of his son = y years
According to the conditions,
2y + x = 10 …(i)
2x + y = 95 …(ii)
From (i),
x = 70 – 2y
Substituting the value of x in (ii),
2 (70 – 2y) + y = 95
⇒ 140 – 4y + y = 95
⇒ -3y = 95 – 140 = -45
⇒ -3y = -45
⇒ y = 15
and x = 70 – 2y = 70 – 2 x 15 = 70 – 30 = 40
Age of father = 40 years
and age of his son = 15 years

Question 45.
Solution:
Let present age of a woman = x years
and age of her daughter = y years
According to the conditions,
x = 3y + 3 …(i)
3 years hence,
Age of woman = x + 3 years
and age of her daughter = y + 3 years
x + 3 = 2 (y + 3) + 10
⇒ x + 3 = 2y + 6 + 10
⇒x = 2y + 16 – 3 = 2y + 13 …(ii)
From (i),
3y + 3 = 2y + 13
⇒ 3y – 2y = 13 – 3
⇒ y = 10
and x = 3y + 3 = 3 x 10 + 3 = 30 + 3 = 33
Present age of woman = 33 years
and age of her daughter = 10 years

Question 46.
Solution:
Let cost price of tea set = ₹ x
and of lemon set = ₹ y
According to the conditions,
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 24

Question 47.
Solution:
Let fixed charges = ₹ x (for first three days)
and then additional charges for each day = ₹ y
According to the conditions,
Mona paid ₹ 27 for 7 dyas
x + (7 – 3) x y = 27
⇒ x + 4y = 27
and Tanvy paid ₹ 21 for 5 days
x + (5 – 3) y = 21
⇒ x + 2y = 21 …(ii)
Subtracting,
2y = 6 ⇒ y = 3
But x + 2y = 21
⇒ x + 2 x 3 = 21
⇒ x + 6 = 21
⇒ x = 21 – 6 = 15
Fixed charges = ₹ 15
and additional charges per day = ₹ 3

Question 48.
Solution:
Let x litres of 50% solution be mixed with y litres of 25% solution, then
x + y = 10 …(i)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 25
Subtracting (i) from (ii),
x = 6
and x + y = 10
⇒ 6 + y = 10
⇒ y = 10 – 6 = 4
50% solution = 6 litres
and 25% solution = 4 litres

Question 49.
Solution:
Let x g of 18 carat be mixed with y g of 12 carat gold to get 120 g of 16 carat gold, then
x + y = 120 …(i)
Now, gold % in 18-carat gold = \(\frac { 18 }{ 24 }\) x 100 = 75%
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 26
⇒ 3x + 2y = 320 …(ii)
From (i),
x = 120 – y
Substituting the value of x in (ii),
3 (120 – y) + 2y = 320
⇒ 360 – 3y + 2y = 320
⇒ -y = 320 – 360
⇒ -y = -40
⇒ y = 40
and 40 + x = 120
⇒ x = 120 – 40 = 80
Hence, 18 carat gold = 80 g
and 12-carat gold = 40 g

Question 50.
Solution:
Let x litres of 90% pure solution be mixed withy litres of 97% pure solution to get 21 litres of 95% pure solution. Then,
x + y = 21 …(i)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 27
⇒ 90x + 97y = 1995
From (i), x = 21 – y
Substituting the value of x in (ii),
90 (21 – y) + 97y = 1995
⇒ 1890 – 90y + 97y = 1995
⇒ 7y = 1995 – 1890 = 105
⇒ y =15
and x = 21 – y = 21 – 15 = 6
90% pure solution = 6 litres
and 97% pure solution = 15 litres

Question 51.
Solution:
Let larger supplementary angle = x°
and smaller angle = y°
According to the conditions,
x + y = 180° …(i)
x = y + 18° …(ii)
From (i),
y + 18° + y = 180°
⇒ 2y = 180° – 18° = 162°
⇒ 2y = 162°
⇒ y = 81°
and x= 180°- 81° = 99°
Hence, angles are 99° and 81°

Question 52.
Solution:
In ∆ABC,
∠A = x, ∠B = (3x – 2)°, ∠C = y°, ∠C – ∠B = 9°
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 28

Question 53.
Solution:
In a cyclic quadrilateral ABCD,
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3E 29

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RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself

RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself

These Solutions are part of RS Aggarwal Solutions Class 10. Here we have given RS Aggarwal Solutions Class 10 Chapter 3 Linear equations in two variables Test Yourself.

RS Aggarwal Solutions Class 10 Chapter 3

MCQ
Question 1.
Solution:
(a)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 1

Question 2.
Solution:
(d)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 2
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 3

Question 3.
Solution:
(a)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 4

Question 4.
Solution:
(d)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 5

Short-Answer Questions
Question 5.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 6

Question 6.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 7

Question 7.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 8
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 9

Question 8.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 10

Question 9.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 11

Question 10.
Solution:
Let first number = x
and second number = y
According to the conditions, x – y = 26 …(i)
and x = 3y …..(ii)
From (i),
3y – y = 26
⇒ 2y = 26
⇒ y = 13
and x = 3 x 13 = 39
Numbers are 39 and 13

Short-Answer Questions (3 marks)
Question 11.
Solution:
23x + 29y = 98 …..(i)
29x + 23y = 110 …..(ii)
Adding, we get 52x + 52y = 208
x + y = 4 …..(iii) (Dividing by 52)
and subtracting,
-6x + 6y = -12
x – y = 2. …..(iv) (Dividing by -6)
Adding (iii) and (iv),
2x = 6 ⇒ x = 3
Subtracting,
2x = 2 ⇒ y = 1
Hence, x = 3, y = 1

Question 12.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 12
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 13
x = 1, y = \(\frac { 3 }{ 2 }\)

Question 13.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 14
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 15

Question 14.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 16

Question 15.
Solution:
Let cost of one pencil = ₹ x
and cost of one pen = ₹ y
According to the condition,
5x + 7y = 195 …(i)
7x + 5y= 153 …(ii)
Adding, (i) and (ii)
12x + 12y = 348
x + y = 29 ….(iii) (Dividing by 12)
and subtracting,
-2x + 2y = 42
-x + y = 21 …..(iv) (Dividing by -2)
Now, Adding (iii) and (iv),
2y = 50 ⇒ y = 25
and from (iv),
-x + 25 = 21 ⇒ -x = 21 – 25 = -4
x = 4
Cost of one pencil = ₹ 4
and cost of one pen = ₹ 25

Question 16.
Solution:
2x – 3y = 1, 4x – 3y + 1 = 0
2x – 3y = 1
2x = 1 + 3y
x = \(\frac { 1 + 3y }{ 2 }\)
Giving some different values to y, we get corresponding values of x as given below
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 17
Now plot the points (2, 1), (5, 3) and (-1, -1) on the graph and join them to get a line.
Similarly,
4x – 3y + 1 = 0
⇒ 4x = 3y – 1
⇒ x = \(\frac { 3y – 1 }{ 4 }\)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 18
Now plot the points (-1, -1), (-4, -5) and (2, 3) on the graph and join them to get another line which intersects the first line at the point (-1, -1).
Hence, x = -1, y = -1
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 19

Long-Answer Questions
Question 17.
Solution:
We know that opposite angles of a cyclic quadrilateral are supplementary.
∠A + ∠C = 180° and ∠B + ∠D = 180°
Now, ∠A = 4x° + 20°, ∠B = 3x° – 5°, ∠C = 4y° and ∠D = 7y° + 5°
But ∠A + ∠C = 180°
4x + 20° + 4y° = 180°
⇒ 4x + 4y = 180° – 20 = 160°
x + y = 40° …(i) (Dividing by 4)
and ∠B + ∠D = 180°
⇒ 3x – 5 + 7y + 5 = 180°
⇒ 3x + 7y = 180° …(ii)
From (i), x = 40° – y
Substituting the value of x in (ii),
3(40° – y) + 7y = 180°
⇒ 120° – 3y + 7y = 180°
⇒ 4y = 180°- 120° = 60°
y = 15°
and x = 40° – y = 40° – 15° = 25°
∠A = 4x + 20 = 4 x 25 + 20 = 100 + 20= 120°
∠B = 3x – 5 = 3 x 25 – 5 = 75 – 5 = 70°
∠C = 4y = 4 x 15 = 60°
∠D = 7y + 5 = 7 x 15 + 5 = 105 + 5 = 110°

Question 18.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 20
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 21

Question 19.
Solution:
Let numerator of a fraction = x
and denominator = y
Fraction = \(\frac { x }{ y }\)
According to the conditions,
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 22
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 23

Question 20.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Test Yourself 24

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RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS

RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS

These Solutions are part of RS Aggarwal Solutions Class 10. Here we have given RS Aggarwal Solutions Class 10 Chapter 3 Linear equations in two variables MCQS.

RS Aggarwal Solutions Class 10 Chapter 3

Choose the correct answer in each of the following questions.
Question 1.
Solution:
(c)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 1

Question 2.
Solution:
(c)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 2

Question 3.
Solution:
(a)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 3

Question 4.
Solution:
(d)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 4

Question 5.
Solution:
(a)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 5
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 6

Question 6.
Solution:
(b)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 7
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 8

Question 7.
Solution:
(c) 4x + 6y = 3xy, 8x + 9y = 5xy
Dividing each term by xy,
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 9
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 10

Question 8.
Solution:
(a)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 11

Question 9.
Solution:
(c)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 12

Question 10.
Solution:
(b)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 13
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 14

Question 11.
Solution:
(d)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 15

Question 12.
Solution:
(b)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 16
RS AggarRS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 17wal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 16

Question 13.
Solution:
(a)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 18

Question 14.
Solution:
(d)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 19
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 20

Question 15.
Solution:
(d)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 21

Question 16.
Solution:
(d)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 22
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 23

Question 17.
Solution:
(d)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 24

Question 18.
Solution:
(d) The system of equations is consistent then their graph lines will be either intersecting or coincident.

Question 19.
Solution:
(a) The pair of lines of equation is inconsistent then the system will not have no solution i.e., their lines will be parallel.

Question 20.
Solution:
(b)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 25

Question 21.
Solution:
(b) ABCD is a cyclic quadrilateral
∠A = (x + y + 10)°, ∠B = (y + 20)°, ∠C = (x + y – 30)° and ∠D = (x + y)°
∠A + ∠C = 180°
Now, x + y + 10°+ x + y – 30° = 180°
⇒ 2x + 2y – 20 = 180°
⇒ 2x + 2y = 180° + 20° = 200°
⇒ x + y = 100° …(i)
and ∠B + ∠D = 180°
⇒ y + 20° + x + y = 180°
⇒ x + 2y = 180° – 20° = 160° …(ii)
Subtracting,
-y = -60° ⇒ y = 60°
and x + 60° = 100°
⇒ x = 100° – 60° = 40°
Now, ∠B = y + 20° = 60° + 20° = 80°

Question 22.
Solution:
(d) Let one’s digit of a two digit number = x
and ten’s digit = y
Number = x + 10y
By interchanging the digits,
One’s digit = y
and ten’s digit = x
Number = y + 10x
According to the conditions,
x + y = 15 …(i)
y + 10x = x + 10y + 9
⇒ y + 10x – x – 10y = 9
⇒ 9x – 9y = 9
⇒ x – y = 1 …(ii)
Adding (i) and (ii),
2x = 16 ⇒ x = 8
and x + y = 15
⇒ 8 + y = 15
⇒ y = 15 – 8 = 7
Number = x + 10y = 8 + 10 x 7 = 8 + 70 = 78

Question 23.
Solution:
(b) Let the numerator of a fractions = x
and denominator = y
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 26

Question 24.
Solution:
(d) Let present age of man = x years
and age of his son = y years
5 years hence,
Age of man = (x + 5) years
and age of son = y + 5 years
(x + 5) = 3 (y + 5)
⇒ x + 5 = 3y + 15
x = 3y + 15 – 5
x = 3y + 10 ……(i)
and 5 years earlier
Age of man = x – 5 years
and age of son = y – 5 years
x – 5 = 7 (y – 5)
x – 5 = 7y – 35
⇒ x = 7y – 35 + 5
x = 7y – 30 ……….(ii)
From (i) and (ii),
7y – 30 = 3y + 10
⇒ 7y – 3y = 10 + 30
⇒ 4y = 40
y = 10
x = 3y + 10 = 3 x 10 + 10 = 30 + 10 = 40
Present age of father = 40 years

Question 25.
Solution:
(b)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 27

Question 26.
Solution:
(c)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 28

Question 27.
Solution:
(a)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables MCQS 29
The system has infinitely many solutions.
The lines are coincident.

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RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F

RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F

These Solutions are part of RS Aggarwal Solutions Class 10. Here we have given RS Aggarwal Solutions Class 10 Chapter 3 Linear equations in two variables Ex 3F.

RS Aggarwal Solutions Class 10 Chapter 3

Very-Short and Short-Answer Questions
Question 1.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 1
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 2

Question 2.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 3
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 4

Question 3.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 5

Question 4.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 6
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 7

Question 5.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 8

Question 6.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 9

Question 7.
Solution:
Let first, number = x
and second number = y
x – y = 5
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 10

Question 8.
Solution:
Let cost of one pen = ₹ x
and cost of one pencil = ₹ y
According to the conditions,
5x + 8y = 120 …(i)
8x + 5y = 153 …(ii)
Adding, we get
13x + 13y = 273
x + y = 21 …(iii) (Dividing by 13)
and subtracting (i) from (ii),
3x – 3y = 33
⇒ x – y = 11 …….(iv) (Dividing by 3)
Again adding (iii) and (iv),
2x = 32 ⇒ x = 16
Subtracting,
2y = 10 ⇒ y = 5
Cost of 1 pen = ₹ 16
and cost of 1 pencil = ₹ 5

Question 9.
Solution:
Let first number = x
and second number = y
According to the conditions,
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 11
and x + y = 80
⇒ x + 15 = 80
x = 80 – 15 = 65
Numbers are : 65, 15

Question 10.
Solution:
Let one’s digit of a two digits number = x
and ten’s digit = y
Number = x + 10y
By reversing its digits One’s digit = y
and ten’s digit = x
Then number = y + 10x
According to the conditions,
x + y = 10 …(i)
x + 10y – 18 = y + 10x
x+ 10y – y – 10x = 18
⇒ -9x + 9y = 18
⇒ x – y = -2 (Dividing by -9) …..(ii)
Adding (i) and (ii),
2x = 8 ⇒ x = 4
and by subtracting,
2y = 12 ⇒ y = 6
Number = x + 10y = 4 + 10 x 6 = 4 + 60 = 64

Question 11.
Solution:
Let number of stamps of 20p = x
and stamps of 25 p = y
According to the conditions,
x + y = 47 …..(i)
20x + 25y = 1000
4x + 5y = 200 …(ii)
From (i), x = 47 – y
Substituting the value of x in (ii),
4 (47 – y) + 5y = 200
188 – 4y + 5y = 200
⇒ y = 200 – 188 = 12
and x + y = 47
⇒ x + 12 = 47
⇒ x = 47 – 12 = 35
Hence, number of stamps of 20 p = 35
and number of stamps of 25 p = 12

Question 12.
Solution:
Let number of hens = x
and number of cows = y
According to the conditions,
x + y = 48 …..(i)
x x 2 + y x 4 = 140
⇒ 2x + 4y = 140
⇒ x + 2y = 70 ……(ii)
Subtracting (i) from (ii),
y = 22
and x + y = 48
⇒ x + 22 = 48
⇒ x = 48 – 22 = 26
Number of hens = 26
and number of cows = 22

Question 13.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 12
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 13

Question 14.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 14
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 15

Question 15.
Solution:
12x + 17y = 53 …(i)
17x + 12y = 63 …(ii)
Adding, 29x + 29y = 116
Dividing by 29,
x + y = 4 …(iii)
Subtracting,
-5x + 5y = -10
⇒ x – y = 2 …(iv) (Dividing by -5)
Adding (iii) and (iv)
2x = 6 ⇒ x = 3
Subtracting,
2y = 2 ⇒ y = 1
x = 3, y = 1
x + y = 3 + 1 = 4

Question 16.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 16

Question 17.
Solution:
kx – y = 2
6x – 2y = 3
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 17

Question 18.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 18

Question 19.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 19
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 20

Question 20.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 21

Question 21.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 22
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3F 23

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RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3C

RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3C

These Solutions are part of RS Aggarwal Solutions Class 10. Here we have given RS Aggarwal Solutions Class 10 Chapter 3 Linear equations in two variables Ex 3C.

RS Aggarwal Solutions Class 10 Chapter 3

Solve each of the following systems of equations by using the method of cross multiplication:
Question 1.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3C 1
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3C 2

Question 2.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3C 3

Question 3.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3C 4

Question 4.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3C 5

Question 5.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3C 6

Question 6.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3C 7
x = 15, y= 5

Question 7.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3C 8

Question 8.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3C 9

Question 9.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3C 10

Question 10.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3C 11
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3C 12

Question 11.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3C 13
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3C 14

Question 12.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3C 15
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3C 16

Question 13.
Solution:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3C 17

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RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A

RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A

These Solutions are part of RS Aggarwal Solutions Class 10. Here we have given RS Aggarwal Solutions Class 10 Chapter 3 Linear equations in two variables Ex 3A.

RS Aggarwal Solutions Class 10 Chapter 3

Solve each of the following systems of equations graphically.
Question 1.
Solution:
2x + 3y = 2 …..(i)
x – 2y = 8 …(ii)
From Eq. (i),
⇒ 2x = 2 – 3y
⇒x = \(\frac { 2 – 3y }{ 2 }\)
Giving some different values to y, we get corresponding values of x as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 1
Now, plot the points (1, 0), (-2, 2) and (4, -2) on the graph and join them to get a line.
Similarly x – 2y = 8 ⇒ x = 8 + 2y
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 2
Now plot the points (6, -1), (4, -2) and (2, -3) on the graph and join them to get another line.
We see that these two lines intersect each other at point(4, -2).
x = 4, y = -2
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 3

Question 2.
Solution:
3x + 2y = 4
⇒ 3x = 4 – 2y
⇒ x = \(\frac { 4 – 2y }{ 3 }\)
Giving some different values to y, we get corresponding values of x as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 4
Now plot the points (0, 2), (2, -1) and (4, -4) on the graph and join them to get a line. Similarly,
2x – 3y = 7
2x = 3y+ 7
x = \(\frac { 3y+ 7 }{ 2 }\)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 5
Now plot the points on the graph and join them to get another line.
We see that these two lines intersect each other at point (2, -1).
x = 2, y = -1
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 6

Question 3.
Solution:
2x + 3y = 8
⇒ 2x = 8 – 3y
x = \(\frac { 8 – 3y }{ 2 }\)
Now, giving some different values to y, we get corresponding values of x as given below
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 7
Now, we plot the points (4,0), (2,3) and (0, 6) on the graph and join them to get a line.
Similarly,
x – 2y + 3 = 0
x = 2y – 3
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 8
Now, plot the points (-3, 0), (-1, 1) and (1, 2) on the graph and join them to get another line.
We see that these two lines intersect each other at the point (1, 2).
x = 1, y = 2
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 9

Question 4.
Solution:
2x – 5y + 4 = 0
⇒ 2x = 5y – 4
x = \(\frac { 5y – 4 }{ 2 }\)
Giving some different values to y, we get corresponding values of x as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 10
Now, plot the points (-2, 0) (3, 2) and (8,4) on the graph and join them to get a line.
Similarly,
2x + y – 8 = 0
⇒ y = 8 – 2x
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 11
Plot the points (1, 6), (2, 1) and (3, 2) on the graph and join them to get another line.
We see that these two lines intersect each other at the point (3, 2).
x = 3, y = 2
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 12

Question 5.
Solution:
3x + 2y = 12
⇒ 3x = 12 – 2y
x = \(\frac { 12 – 2y }{ 2 }\)
Giving some different values to y, we get corresponding the values of x as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 13
Now, we plot the points (4,0), (2,3) and (0, 6) on the graph and join them to get a line.
Similarly,
5x – 2y = 4
⇒ 5x = 4 + 2 y
⇒ x = \(\frac { 4 + 2 y }{ 5 }\)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 14
Plot the points (0, -2), (2, 3) and (4, 8) on the graph and join them to get another line.
We see that these two lines intersect each other at the point (2, 3).
x = 2, y = 3
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 15

Question 6.
Solution:
3x + y + 1 = 0 ⇒y = -3x – 1
Giving some different values to x, we get corresponding values of y as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 16
Now, plot the points (0, -1), (-1, 2) and (-2, 5) on the graph and join them to get a line.
Similarly,
2x – 3y + 8 = 0
2x = 3y – 8
x = \(\frac { 3y – 8 }{ 2 }\)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 17
Now, plot the points (-4, 0), (-1, 2) and (2, 4) on the graph and join them to get another line.
We see that these two lines intersect each other at the points (-1, 2).
x = -1, y = 2
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 18

Question 7.
Solution:
2x + 3y + 5 = 0
2x = -3y – 5
x = \(\frac { -3y – 5 }{ 2 }\)
Giving some different values to y, we get corresponding values of x as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 19
Now, plot the points (-4, 1), (-1, -1) and (2, -3) on the graph and join them to get a line. Similarly,
3x – 2y – 12 = 0
⇒ 3x = 2y + 12
x = \(\frac { 2y + 12 }{ 3 }\)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 20
Plot the points (4, 0), (0, -6) and (2, -3) on the graph and join them to get another line.
We see that these two lines intersect each other at the point (2, -3).
x = 2, y = -3
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 21

Question 8.
Solution:
2x – 3y + 13 = 0
⇒ 2x = 3y – 13
⇒ x = \(\frac { 3y – 13 }{ 2 }\)
Giving some different values to y, we get corresponding values of x as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 22
Now, plot the points (-5, 1), (-2, 3) and (1, 5) on the graph and join them to get a line.
Similarly,
3x – 2y + 12 = 0
3x = 2y – 12
x = \(\frac { 2y – 12 }{ 3 }\)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 23
Now, plot the points (-4, 0), (-2, 3) and (0, 6) on the graph and join them to get another line.
We see that these lines intersect each other at the point (-2, 3).
x = -2, y = 3
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 24

Question 9.
Solution:
2x + 3y – 4 = 0
⇒ 2x = 4 – 3y
⇒ x = \(\frac { 4 – 3y }{ 2 }\)
Giving some different values to y, we get corresponding values of x as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 25
Plot the points (2, 0) (-1, 2) and (5, -2) on the graph and join them to get a line.
Similarly,
3x – y + 5 = 0
⇒ -y = -5 – 3x
⇒ y = 5 + 3x
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 26
Plot the points (0, 5), (-1, 2) and (-2, -1) on the graph and join them to get another line.
We see that these two lines intersect each other at the point (-1, 2).
x = -1, y = 2
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 27

Question 10.
Solution:
x + 2y + 2 = 0
⇒ x = – (2y + 2)
Giving some different values to y, we get corresponding the values of x as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 28
Plot the points (-2,0), (0, -1) and (2, -2) on the graph and join them to get a line.
Similarly,
3x + 2y – 2 = 0
⇒ 3x = 2 – 2y
x = \(\frac { 2 – 2y }{ 3 }\)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 29
Plot the points (0, 1), (2, -2) and (-2, 4) on the graph and join them to get another line.
We see that these two lines intersect each other at the point (2, -2).
x = 2, y = -2
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 30

Solve each of the following given systems of equations graphically and find the vertices and area of the triangle formed by these lines and the x-axis:
Question 11.
Solution:
x – y + 3 = 0
⇒ x = y – 3
Giving some different value to y, we get corresponding values of x as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 31
Plot the points (-3, 0), (-1, 2) and (0, 3) on the graph and join them to get a line.
Similarly,
2x + 3y – 4 = 0
⇒ 2x = 4 – 3y
x = \(\frac { 4 – 3y }{ 2 }\)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 32
Plot the points (2, 0), (-1, 2) and (5, -2) on the graph and join them to get another line.
We see that these line intersect each other at (-1, 2) and x-axis at A (-3, 0) and D (2, 0).
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 33
Area of ∆BAD = \(\frac { 1 }{ 2 }\) x base x altitude
= \(\frac { 1 }{ 2 }\) x AD x BL
= \(\frac { 1 }{ 2 }\) x 5 x 2 = 5 sq.units

Question 12.
Solution:
2x – 3y + 4 = 0
⇒ 2x = 3y – 4
x = \(\frac { 3y – 4 }{ 2 }\)
Giving some different values to y, we get corresponding value of x as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 34
Plot the points (-2, 0), (1, 2) and (4, 4) on the graph and join them to get a line.
Similarly,
x + 2y – 5 = 0
x = 5 – 2y
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 35
Now, plot the points (5, 0), (3, 1) and (1, 2) on the graph and join them to get another line.
We see that there two lines intersect each other at the point B (1, 2) and intersect x- axis at A (-2, 0) and D (5, 0) respectively.
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 36
Now, area of ∆BAD = \(\frac { 1 }{ 2 }\) x base x altitude
= \(\frac { 1 }{ 2 }\) x AD x BL
= \(\frac { 1 }{ 2 }\) x 7 x 2
= 7 sq. units

Question 13.
Solution:
4x – 3y + 4 = 0
⇒ 4x = 3y – 4
x = \(\frac { 3y – 4 }{ 4 }\)
Giving some different values to y, we get corresponding value of x as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 37
Plot the points (-1, 0), (2, 4) and (-4, -4) on the graph and join them, to get a line.
Similarly,
4x + 3y – 20 = 0
4x = 20 – 3y
x = \(\frac { 20 – 3y }{ 4 }\)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 38
Plot the points (5, 0), (2, 4) and (-1, 8) on the graph and join them to get a line.
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 39
We see that these two lines intersect each other at the point B (2, 4) and intersect x-axis at A (-1, 0) and D (5, 0).
Area ∆BAD = \(\frac { 1 }{ 2 }\) x base x altitude
= \(\frac { 1 }{ 2 }\) x AD x BL
= \(\frac { 1 }{ 2 }\) x 6 x 4 = 12 sq. units

Question 14.
Solution:
x – y + 1 = 0 ⇒ x = y – 1
Giving some different values toy, we get the values of x as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 40
Plot the points (-1, 0), (0, 1) and (1, 2) on the graph and join them to get a line.
Similarly,
3x + 2y – 12 = 0
⇒ 3x = 12 – 2y
x = \(\frac { 12 – 2y }{ 3 }\)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 41
Plot the points (4, 0), (2, 3) and (0, 6) on the graph and join them to get another line.
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 42
We see that these two lines intersect each ohter at the point E (2, 3) and intersect x- axis at A (-1, 0) and D (4, 0).
Area of ∆EAD = \(\frac { 1 }{ 2 }\) x base x altitude 1
= \(\frac { 1 }{ 2 }\) x AD x EL
= \(\frac { 1 }{ 2 }\) x 5 x 3
= \(\frac { 15 }{ 2 }\)
= 7.5 sq. units

Question 15.
Solution:
x – 2y + 2 = 0 ⇒ x = 2y – 2
Giving some different values to y, we get corresponding values of x as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 43
Plot the points (-2, 0), (0, 1), (2, 2) on the graph and join them to get a line.
Similarly,
2x + y – 6 = 0
⇒ y = 6 – 2x
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 44
Plot the points on the graph and join them to get a line.
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 45
We see that these two lines intersect each other at the point C (2, 2) and intersect the x-axis at A (-2, 0) and F (3, 0).
Now, area of ∆CAF = \(\frac { 1 }{ 2 }\) x base x altitude
= \(\frac { 1 }{ 2 }\) x AF x CL
= \(\frac { 1 }{ 2 }\) x 5 x 2 = 5 sq. units

Solve each of the following given systems of equations graphically and find the vertices and area of the triangle formed by these lines and the y-axis:
Question 16.
Solution:
2x – 3y + 6 = 0
⇒ 2x = 3y – 6
x = \(\frac { 3y – 6 }{ 2 }\)
Giving some different values to y, we get corresponding values of x, as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 46
Now, plot the points (-3, 0), (0, 2), (3, 4) on the graph and join them to get a line.
Similarly,
2x + 3y – 18 = 0
2x = 18 – 3y
x = \(\frac { 18 – 3y }{ 2 }\)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 47
Plot the points (0, 6), (3, 4) and (6, 2) on the graph and join them to get a line.
We see that these two lines intersect each other at C (3, 4) and intersect y-axis at B (0, 2) and D (0, 6).
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 48
Now, area of ∆CBD = \(\frac { 1 }{ 2 }\) x base x altitude
= \(\frac { 1 }{ 2 }\) x BD x CL
= \(\frac { 1 }{ 2 }\) x 4 x 3 sq. units = 6 sq. units

Question 17.
Solution:
4x – y – 4 = 0
⇒ 4x = y + 4
x = \(\frac { y + 4 }{ 2 }\)
Giving some different values to y, we get corresponding values of x as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 49
Plot the points (1, 0), (0, -4) and (2, 4) on the graph and join them to get a line.
Similarly,
3x + 2y – 14 = 0
2y = 14 – 3x
y = \(\frac { 14 – 3x }{ 2 }\)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 50
Now, plot the points (0, 7), (2, 4) and (4, 1) on the graph and join them to get another line.
We see that these two lines intersect each other at C (2, 4) and y-axis at B (0, -4) and D (0, 7) respectively.
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 51
Area of ∆CBD = \(\frac { 1 }{ 2 }\) x base x altitude
= \(\frac { 1 }{ 2 }\) x BD x CL
= \(\frac { 1 }{ 2 }\) x 11 x 2 sq. units = 11 sq. units

Question 18.
Solution:
x – y – 5 = 0 ⇒ x = y + 5
Giving some different values to y, we get corresponding values of x as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 52
Plot the points (5, 0), (0, -5) and (1, -4) on the graph and join these to get a line.
Similarly,
3x + 5y – 15 = 0
3x = 15 – 5y
x = \(\frac { 15 – 5y }{ 3 }\)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 53
Plot the points (5, 0), (0, 3) and (-5, 6) on the graph and join them to get a line.
We see that these two lines intersect each other at A (5, 0) and y-axis at B (0, -5) and E (0, 3) respectively.
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 54
Now area of ∆ABE = \(\frac { 1 }{ 2 }\) x base x altitude
= \(\frac { 1 }{ 2 }\) x BE x AL
= \(\frac { 1 }{ 2 }\) x 8 x 5 sq. units = 20 sq. units

Question 19.
Solution:
2x – 5y + 4 = 0
⇒ 2x = 5y – 4
x = \(\frac { 5y – 4 }{ 2 }\)
Giving some different values to y, we get corresponding values of x as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 55
Plot the points (-2, 0), (3, 2) and (-7, -2) on the graph and join them to get a line.
Similarly,
2x + y – 8 = 0
2x = 8 – y
x = \(\frac { 8 – y }{ 2 }\)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 56
Plot the points (4, 0), (3, 2) and (2, 4) on the graph and join them to get a line.
We see that these two lines intersect each other at B (3, 2) and y-axis at G (0, 1) and H (0, 8) respectively.
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 57
Now area of ∆EGH = \(\frac { 1 }{ 2 }\) x base x altitude
= \(\frac { 1 }{ 2 }\) x GH x EL
= \(\frac { 1 }{ 2 }\) x 7 x 3 sq. units
= \(\frac { 21 }{ 2 }\) = 10.5 sq. units

Question 20.
Solution:
5x – y – 7 = 0 ⇒ y = 5x – 7
Giving some different values to x, we get corresponding values of y as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 58
Plot the points (0, -7), (1, -2), (2, 3) on the graph and join them to get a line.
Similarly,
x – y + 1 = 0 ⇒ x = y – 1
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 59
Plot the points (-1, 0), (1, 2) and (2, 3) on the graph and join them to get a line.
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 60
We see that these two lines intersect each other at C (2, 3) and intersect y-axis at A (0, -7) and F (0, 1) respectively.
Now, area of ∆CAF = \(\frac { 1 }{ 2 }\) x base x altitude
= \(\frac { 1 }{ 2 }\) x AF x CL
= \(\frac { 1 }{ 2 }\) x 8 x 2 = 8 sq.units

Question 21.
Solution:
2x – 3y – 12 ⇒ 2x = 12 + 3y
x = \(\frac { 12 + 3y }{ 2 }\)
Giving some different values to y, we get corresponding values of x as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 61
Plot the points (6, 0), (3, -2) and (0, -4) on the graph and join them to get a line.
Similarly,
x + 3y = 6 ⇒ x = 6 – 3y
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 62
Plot the points (6, 0), (0, 2) and (-6, 4) on the graph and join them to get a line.
We see that these two lines intersect each other at the points A (6, 0) and intersect the y-axis at C (0, -4) and E (0, 2) respectively.
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 63
Now area of ∆ACE = \(\frac { 1 }{ 2 }\) x base x altitude
= \(\frac { 1 }{ 2 }\) x CE x AO
= \(\frac { 1 }{ 2 }\) x 6 x 6 sq. units = 18 sq.units

Show graphically that each of the following given systems of equations has infinitely many solutions:
Question 22.
Solution:
2x + 3y = 6
2x = 6 – 3y
x = \(\frac { 6 – 3y }{ 2 }\)
Giving some different values to y, we get the corresponding val ues of x as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 64
Plot the points (3, 0), (0, 2) and (-3, 4) on the graph and join them to get a line.
Similarly,
4x + 6y = 12
4x = 12 – 6y
x = \(\frac { 12 – 6y }{ 2 }\)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 65
on the graph and join them to get a line.
We see that all the points lie on the same straight line.
This system has infinite many solutions.
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 66

Question 23.
Solution:
3x – y = 5
⇒ y = 3x – 5
Giving some different values to x, we get corresponding values of y as shown below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 67
Now, plot the points (0, -5), (1, -2), (2, 1) on the graph and join them to get a line:
Similarly,
6x – 2y = 10
⇒ 6x = 10 + 2y
x = \(\frac { 10 + 2y }{ 6 }\)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 68
Plot the points (2, 1), (4, 7), (3, 4) on the graph and join them to get another line.
We see that these lines coincide each other.
This system has infinite many solutions.
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 69

Question 24.
Solution:
2x + y = 6
y = 6 – 2x
Giving some different values to x, we get corresponding values of y as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 70
Plot the points (0, 6), (2, 2), (4, -2) on the graph and join them to get a line.
Similarly,
6x + 3y = 18
⇒ 6x = 18 – 3y
⇒ x = \(\frac { 18 – 3y }{ 2 }\)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 71
Now, plot the points (3, 0), (1, 4) and (5, -4) on the graph and join them to get another line.
We see that these two lines coincide each other.
This system has infinitely many solutions
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 72

Question 25.
Solution:
x – 2y = 5 ⇒ x = 5 + 2y
Giving some different values to y, we get corresponding values of x as shown below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 73
Plot the points (5, 0), (3, -1), (1, -2) on the graph and join them to get a line.
similarly,
3x – 6y = 15
⇒ 3x = 15 + 6y
x = \(\frac { 15 + 6y }{ 3 }\)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 74
Plot the points (7, 1), (-1, -3) and (-3, -4) on the graph and join them to get another line.
We see that all the points lie on the same line.
Lines coincide each other.
Hence, the system has infinite many solutions.
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 75

Show graphically that each of the following given systems of equations is inconsistent, i.e., has no solution:
Question 26.
Solution:
x – 2y = 6 ⇒ x = 6 + 2y
Giving some different values to y, we get corresponding values of x as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 76
Plot the points (6, 0), (4, -1) and (0, -3) on the graph and join them to get a line.
Similarly,
3x – 6y = 0
⇒ 3x = 6y
⇒ x = 2y
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 77
Plot the points (0, 0), (2, 1), (4, 2) on the graph and join them to get a line.
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 78
We see that these two lines are parallel i.e., do not intersect each other.
This system has no solution.

Question 27.
Solution:
2x + 3y = 4
⇒ 2x = 4 – 3y
⇒ x = \(\frac { 4 – 3y }{ 2 }\)
Giving some different values to y, we get corresponding values of x as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 79
Plot the points (2, 0), (-1, 2) and (5, -2) on the graph and join them to get a line.
Similarly,
4x + 6y = 12 ⇒ 4x = 12 – 6y
x = \(\frac { 12 – 6y }{ 4 }\)
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 80
Plot the points (3, 0), (0, 2) and (-3, 4) on the graph and join them to get another line.
We see that two lines are parallel i.e., these do not intersect each other at any point.
Therefore the system has no solution.
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 81

Question 28.
Solution:
2x + y = 6, y = 6 – 2x
Giving some different values to x, we get corresponding values ofy as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 82
Plot the points (0, 6), (1, 4) and (3, 0) on the graph and join them to get a line.
Similarly,
6x + 3y = 20 ⇒ 6x = 20 – 3y
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 83
We see that these two lines are parallel and do not intersect each other.
Therefore this system has no solution.
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 84

Question 29.
Solution:
2x + y = 2 ⇒ y = 2 – 2x
Giving some different values to x, we get corresponding values of y as given below:
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 85
Plot the points (0, 2), (1, 0) and (-2, 6) on the graph and join them to get a line.
Similarly,
2x + y = 6 ⇒ y = 6 – 2x
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 86
Plot the points (0, 6), (2, 2) and (3, 0) on the graph and join them to get another line.
ABFD is the trapezium whose vertices are A (0, 2), B (1, 0), F (3, 0), D (0, 6).
RS Aggarwal Class 10 Solutions Chapter 3 Linear equations in two variables Ex 3A 87
Area of trapezium ABFD = Area ∆DOF – Area ∆AOB
= \(\frac { 1 }{ 2 }\) (DO x OF) – \(\frac { 1 }{ 2 }\) (AO x OB)
= \(\frac { 1 }{ 2 }\) (6 x 3) – \(\frac { 1 }{ 2 }\) (2 x 1) sq.units
= 9 – 1 = 8 sq.units

Hope given RS Aggarwal Solutions Class 10 Chapter 3 Linear equations in two variables Ex 3A are helpful to complete your math homework.

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