Answer:
See below.
Step-by-step explanation:
Point-slope form is y - y1 = m(x - x1) where m = slope and (x1,y1) is a point on the line.
Because the line is horizontal the slope m = 0 so the answer is:-
y - (-9) = 0(x - 5)
or y + 9 = 0(x - 5) which simplifies to:
y + 9 = 0
giving y = -9.
