persamaan garis melalui titik (-3,1) dan (6,7) #pake caranya ya#cara cepat kalo bisa!!)

y-y1 / y2-y1 = x-x1/x2-x1
y-1 / 7-1  = x-(-3)/ 6-(-3)
y-1 / 6 = x+3/9
9(y-1) = 6(x+3)
9y - 9  = 6x+18
-6x + 9y - 27 = 0
6x - 9y + 27 =0
------------------------- : 3
2x - 3y +9 = 0