Question

How do you graph `y = -x-2` by plotting points?

Answer 1

This is a linear equation, so we need only two points and draw a line through them.

Explanation:

You can take any two `x`-values and compute the corresponding `y`'s.
Usually you calculate for `x=0` (`y`-intercept) and `y=0` (`x`-intercept)

`y`-intercept:
`y=-0-2=-2->(0,-2)`

`x`-intercept:
`0=-x-2->x=-2->(-2,0)`

Plot these points and draw the line:
graph{-x-2 [-10, 10, -5, 5]}