tentukan persamaan linier yang melalui titik (2,4) dan (-7,12)

Pers.garis melalui 2 titik
(x1,y1) → (2,4)
(x2,y2) → (-7,12)

(y-y1)/(y2-y1) = (x-x1)/(x2-x1)
(y-4)/(12-4) = (x-2)/(-7-2)
(-9)(y-4) = (8)(x-2)
-9y+36 = 8x-16
8x+9y - 50 = 0