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Similarly if y = –3, y = number then the graph will be the horizontal line parallel to the x-
axis.

Example Represent the solution of the equation 4x –15 = 5.
2. (i) on number line
(ii) in Cartesian plane
Sol. The equation 4x –15 = 5 can be written as 4x = 20

So, x = 5.

(i) Solution on number line can be represented as follows:

( 1
mark)

(ii) The given equation is x = 5.
This means that for all values of the ordinate y, the abscissa x is 5.
Thus, table of values is

X 5 5 5
Y 0 1 2

Plotting the points (5, 0), (5, 1) and (5, 2) and joining them, we get a straight
line l.

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