Question

Draw the graph of the equation y = 3x. Find the value of y, when x = −2.

Answer 1

y = 3x
The table with the values of x and y satisfying the given equation is shown below:

x	1	2
y	3	6

To find the value of y when x = -2, we follow these steps:
(i) From point P, draw a line parallel to Y-axis, intersecting the line at Q.
(ii) From point Q, draw a perpendicular to Y -axis (i.e. point R).
So, the value of y is -6.

The graph of the given equation is as shown: