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

Mar 20, 2018

The direction of the inequality will tell you this information.

#### Explanation:

Example: $y \ge 2 x + 3$

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

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

Example: $y < \frac{1}{2} x - 2$

You would draw the line $y = \frac{1}{2} x - 2$ as a dashed line, then shade below the line since $y$ is less than $\frac{1}{2} x - 2$.

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