Lines parallel x or y axis

Chapter 4 Class 9 Linear Equations in Two Variables
Concept wise

## Lines parallel to x-axis

Equation of x-axis is

y = 0

Equation of lines which are parallel to x-axis is

y = k

where k is a constant

Let us check an example

y = 2

Drawing y = 2 in graph

Since y = 2 for all values of x

Points which satisfy the equation is

 x 0 1 2 –1 y 2 2 2 2

Plotting points on graph

Hence, y = 2 is  line which is parallel to x axis

## Lines parallel to y-axis

Equation of y-axis is

x = 0

Equation of lines which are parallel to y-axis is

x = k

where k is a constant

Let us check an example

x = 1

Drawing x = 1 in graph

Since x = 1 for all values of y

Points which satisfy the equation is

 x 1 1 1 1 y 0 1 2 –1

Plotting points on graph

Hence, x = 1 is  line which is parallel to x axis

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#### Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.