Answer
See graph.
Work Step by Step
We graph:
$f(x)=\left\{\begin{array}{l}
6-x\ ~~~\mathrm{i}\mathrm{f}\ \mathrm{x}\ \leq 3\\
3\ ~~~~~~~~~~\mathrm{i}\mathrm{f}\ \mathrm{x}\ \gt 3
\end{array}\right.$
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