Answer:
a)

b)

Explanation:
Recall the forms of vertical and horizontal lines
Horizontal lines come in the form of
, so the slope of the equation is zero. The value of b will be the y-value of the point that you're given.
This means that the equation for a would be y=1
Vertical lines come in the form of
. For this line, the value of a would be equivalent to the x-value of the given point. Therefore, b. would be
