Tolong bantu kakak untuk besok

Y-y1/y2-y1 = x-x1/x2-x1
y+2/5+2 = x-3/-6-3
y+2/7 = x-3/-9
-9(y+2) = 7(x-3)
-9y-18 = 7x-21
-9y = 7x-12
y = -1/9 (7x-12)
y = -7/9x+4/3

m1 = m2 = -7/9
y-y1 = m2 (x-x1)
y-1 = -7/9 (x-3)
y-1 = -7/9x+7/3
y = -7/9x+10/3