Answer
a) $f(4)= 2$
b) $f(-6)= -1.5$
Work Step by Step
a) The graph shows that when $x= 4$, $y= 2$. Therefore:
\begin{equation}
\begin{aligned}
f(4)&= 2.
\end{aligned}
\end{equation} b) The graph shows that when $y= -1.5$, $x= -6$. Therefore:
\begin{equation}
\begin{aligned}
f(-6) & =-1.5.
\end{aligned}
\end{equation}
