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Exercise 4.2 Class 9 maths 4. Linear Equation In Two Variables - ncert solutions - Toppers Study

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Exercise 4.2 Class 9 maths 4. Linear Equation In Two Variables - ncert solutions - Toppers Study

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Exercise 4.2 class 9 Mathematics Chapter 4. Linear Equation In Two Variables

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Exercise 4.2 Class 9 Maths 4. Linear Equation In Two Variables - Ncert Solutions - Toppers Study
Class 9 Ncert Solutions
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Chapter 4. Linear Equation In Two Variables Exercise 4.2 Class 9

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4. Linear Equation In Two Variables

| Exercise 4.2 |

Exercise 4.2 Class 9 maths 4. Linear Equation In Two Variables - ncert solutions - Toppers Study

Chapter 4. Linear Equation In Two Variables

Exercise 4.2

1. Which one of the following options is true, and why?

y = 3x + 5 has

(i) a unique solution, (ii) only two solutions,

Solution

(iii) infinitely many solution, because we can put many value of x and can get many solution of y.

2. Write four solutions for each of the following equations:

(i) 2x + y = 7

(ii) πx + y = 9

(iii) x = 4y

Solution

3. Check which of the following are solutions of the equation x – 2y = 4 and which are not:

(i) (0, 2)

(ii) (2, 0)

(iii) (4, 0)

Solution :

x = 4 + 2y

(i) (0,2)

Putting value of x and y

= 0 = 4 + 2(2)

= 0 = 4 + 4 = 0 = 8, hence it is not a solution of eq

(ii) (2,0)

Putting value of x and y

= 2 = 4 + 2(0) = 2 = 4, hence it is also not a solution of eq

(iii) (4,0)

Putting value of x and y

= 4 = 4 + 2(0) = 4 = 4, hence it is a solution of eq

(v) (1,1)

Putting value of x and y

= 1 = 4 + 2(1) = 1= 6, hence, it is not a solution of eq

4. Find the value of k, if x = 2, y = 1 is a solution of the equation 2x + 3y = k.

Solution :

2x + 3y = k

Putting the value of x and y

2(2) + 3(1) = k = 4+3 = k = k = 7

Other Pages of this Chapter: 4. Linear Equation In Two Variables

1. Chapter 4. Linear Equation In Two Variables | Exercise 4.1

2. Chapter 4. Linear Equation In Two Variables | Exercise 4.2

3. Chapter 4. Linear Equation In Two Variables | Exercise 4.3

4. Chapter 4. Linear Equation In Two Variables | Exercise 4.4

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