Answer
See graph.
Work Step by Step
We graph:
$f(x)=\left\{\begin{array}{l}
2x+1\ ~~~\mathrm{i}\mathrm{f}\ x\geq 0\\
x\ ~~~~~~~~~~~~\mathrm{i}\mathrm{f}\ \mathrm{x}\ \lt 0
\end{array}\right.$
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