Question

How do you graph `y = x - 4` by plotting points?

Answer 1

Make a list of x values and their corresponding y values. Plot the (x,y) coordinates on the y against x axes. Join the dots and the straight-line graph is obtained.

Explanation:

For example:

When `x=-2` , `y=(-2)-4=-6` .
When `x=0` , `y=(0)-4=-4` .
When `x=3` , `y=(3)-4=-1` .
When `x=4` , `y=(4)-4=0` .
And so on...

By plotting the coordinates of (-2,-6), (0,-4), (3,-1), (4,0), etc. , the points obtained will form a straight line with an equation `y=x-4`.