Answer
$$A=24$$
Work Step by Step
Given the graph below (see Fig.1)
To find the area of the region, we consider the following integral.
So, we get
\begin{align}
A&=\int_{x=0}^{x=8} \int_{y=0}^{y=3} d y d x\\
&=
\int_{x=0}^{x=8}[y]_{0}^{3} d x\\
&=\int_{0}^{8} 3 d x\\
&=[3 x]_{0}^{8}\\
&=24
\end{align}
