Answer
a) $f(2)=2$
b) $f(-1)=3$
Work Step by Step
a) When $x=
2
,$ the corresponding $y-$value in the given set of ordered pairs is $
2
.$ Hence,
\begin{array}{l}\require{cancel}
f(2)=2
.\end{array}
b) When $x=
-1
,$ the corresponding $y-$value in the given set of ordered pairs is $
3
.$ Hence,
\begin{array}{l}\require{cancel}
f(-1)=3
.\end{array}