tuliskan persamaan garis yang melalui dua titik A (2,4) B (-1,2)

persamaan garis 2 titik
A (2,4) 
B (-1,2)

y-y1/y2-y1 = x-x1/x2-x1
y-4/2-4 = x-2/-1-2
y-4/-2 = x-2/-3
-3(y-4) = -2(x-2)
-3y+12 = -2x+4
2x-4 = 3y-12
2x-4+12 = 3y
2x+8 = 3y

y = 2/3x + 8/3