Answer
a. 2, b. 3
Work Step by Step
We want $f(2)$, the y-value of the order pair whose first component is $x=2$. As indicated by the ordered pair, $(2,2)$, for $x=2$, $y=2$. Thus, $f(2)=2$.
We want $f(-1)$, the y-value of the order pair whose first component is $x=-1$. As indicated by the ordered pair, $(-1,3)$, for $x=-1$, $y=3$. Thus, $f(-1)=3$.