## MP Board Class 9th Maths Solutions Chapter 4 Linear Equations in Two Variables Ex 4.4

Question 1.

Give the geometric representations of y = 3 as an equation –

- In one variable
- in two variables.

Solution:

1. Linear equation in one variable

y = 3

2. Linear equation in two variables is

0x + y – 3 = 6

Question 2.

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

- In one variable
- In two variables.

Solution:

1. Linear equation in one variable

2x + 9 = 0

2x = – 9

x = – 4.5

2. Linear equation in two variables

2x + 0y + 9 = 0

Equations of a Line Parallel to the x – axis and y – axis:

This is a special case when the given point lies on the axes, either x – axis or y – axis. If the point lies on x – axis, then y – coordinate will be 0 and if the point lies on y-axis, then the x-coordinate will be 0.

Example 1.

Draw the graph of the equation represented by a straight line which is parallel to the x – axis and at a distance 3 units below it. (NCERT Exemplar)

Solution:

The equation of a line which is parallel to the x-axis and at a distance of 3 units below. It is given by

y = – 3

The solutions of the equation are:

The graph is shown below.