NCERT · Class 9 · Maths

Chapter 4: Linear Equations in Two Variables

Practice each question, then open the answer or worked solution.

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Exercise 4.4

Textbook page 77 · 2 questions

Q1Written answer

Give the geometric representations of y = 3 as an equation

(i) in one variable

(ii) in two variables

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Worked solution

In one variable, y = 3

Ncert solutions class 9 chapter 4-12

(ii) In two variables, 0x+y = 3

When x = 0, y = 3

When x = 1, y = 3

Ncert solutions class 9 chapter 4-13

Q2Written answer

Give the geometric representations of 2x+9 = 0 as an equation

(i) in one variable

(ii) in two variables

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Worked solution

(i) In one variable,

2x+9 = 0

2x = -9

x = -9/2

x = -4.5

Ncert solutions class 9 chapter 4-14

(ii) In two variables,

2x+9 = 0

2x+0y+9 = 0

When y = 0, x = -4.5

When y = 1, x = -4.5

Ncert solutions class 9 chapter 4-15