tolong di jawab no 17.

Persamaan yang melalui titik (x1,y1)
y-y1 = m (x-x1)

Titik (-8,6)
m = 1/2

y-6 = 1/2(x+8)
2(y-6) = x+8
2y - 12 = x + 8
-12 - 8 = x - 2y
x - 2y = -20