Let's find the slope m using the following equation:
m = (y2 - y1)/(x2 - x1)
Where:
(-4,13) = (x1,y1)
(8.-2) = (x2,y2)
m = (-2 - 13)/(8 - (-4)) = -15/12 = -5/4
Now, let's use the point slope equation:
y - y1 = m(x - x1)
y - 13 = -5/4(x - (-4))
y - 13 = -5x/4 - 5
Solve for y:
y = -5x/4 - 5 + 13
y = -5x/4 + 8