Exercise 20 Page 222

To graph the given piecewise function, we should think about the graph of each individual piece of the function. Then we can combine the graphs on one coordinate plane.

$y=2x+1$

First we will graph $y=2x+1$ for the domain $x\le \text{-}1.$ This function has a slope of $2$ and a $y\text{-}$intercept of $1.$ Since the endpoint is included, this piece should end with a closed circle.