Answer
$a)~x=-8$
$b)~y=5$
Work Step by Step
Equation of vertical line that goes through the point $(a,b)$ is given by:
$$x=a$$
Equation of horizontal line that goes through the point $(a,b)$ is given by:
$$y=b$$
Since the given point is $(-8,5)$, the required equations will be:
$a)~x=-8$
$b)~y=5$