Question

How do you know if you need to shade above or below the line?

Answer 1

The direction of the inequality will tell you this information.

Explanation:

Example: `y >= 2x+3`

You would draw the line `y = 2x+3` and shade above the line, since `y` is also greater than `2x+3`.

graph{y>=2x+3 [-10, 10, -5, 5]}

Example: `y < 1/2x-2`

You would draw the line `y=1/2x-2` as a dashed line, then shade below the line since `y` is less than `1/2x-2`.

graph{y<1/2x-2 [-10, 10, -5, 5]}