Question

How do you graph `abs(2x+1)`?

Answer 1

As you know, `y=2x+1` graph looks like this.

graph{2x+1 [-10, 10, -5, 5]}

An absolute value is always positive, so if `2x+1<0`, the sign of `y` should change to positive. Thus, the point below the `x`-axis should reflect in the `x`-axis. Then the answer is

graph{abs(2x+1) [-10, 10, -5, 5]}