Answer
$p(r)=10+3 r$
Work Step by Step
Taking any pair of data points, we see that the data is linear with a slope of
$$m= Δp∕Δr = 3$$. We now find the vertical intercept from
$$
\begin{aligned}
p(r) & =b+3 r \\
13 & =b+3 \cdot 1 \\
b & =10 .
\end{aligned}
$$ Therefore, $p(r)=10+3 r$.
