Answer
$f(-3)=13$
Work Step by Step
Substituting $x$ with $
-3
$ in the given function, $
f(x)=-3x+4
,$ then,
\begin{array}{l}\require{cancel}
f(-3)=-3(-3)+4
\\\\
f(-3)=9+4
\\\\
f(-3)=13
.\end{array}
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