Answer
a. 5, b. 11
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, $(2,5)$, for $x=2$, $y=5$. Thus, $f(2)=5$.
We want $f(-1)$, the y-value of the order pair whose first component is $x=-1$. As indicated by the ordered pair, $(-1,11)$, for $x=-1$, $y=11$. Thus, $f(-1)=11$.