persamaan garis yang melalui titik K (-1 , 4) dan L (8, -2) adalah

K(-1,4) dan L(8, -2)

(y-y1) / (y2 -y1) = (x -x1) / (x2 - x1)
(y - 4) / (-2 - 4) = (x+1) / (8+1)
(y-4) / -6 = (x+1) / 9
9(y-4) = -6(x+1)
9y - 36 = -6x - 6
6x+9y-36+6 = 0
6x + 9y - 30 = 0

(y2 - y1)/(x2 - x1) = (y - y1)/(x - x1)
(-2 - 4)/(8 - (-1)) = (y - 4)/(x - (-1))
-6/9 = (y - 4)/(x + 1)
-2/3 = (y - 4)/(x + 1)
3y - 12 = -2x - 2
2x + 3y = 10
2x + 3y - 10 = 0