#### Answer

(a) $f(2)=3$
(b) $f(-1)=-3$

#### Work Step by Step

(a) The value of $f(2)$ can be found by looking for the value of $y$ on the graph when $x=2$.
The graph shows that when $x=2$, the corresponding value of $y$ is $3$.
Thus, $f(2) =3$.
(b) The value of $f(-1)$ can be found by looking for the value of $y$ on the graph when $x=-1$.
The graph shows that when $x=-1$, the corresponding value of $y$ is $-3$.
Thus, $f(-1) =-3$.