## Precalculus (6th Edition)

The corresponding y-value for $x=4.5$ is $7.5$
$4.5$ is midpoint of $4$ and $5$. This means that the corresponding y-value for $4.5$ is the midpoint of the corresponding y-values of $x=4$ and $x=5$. Thus, $y= \dfrac{6+9}{2}=\dfrac{15}{2}=7.5$ Therefore, the corresponding y-value for $x=4.5$ is $7.5$