Persamaan garis yang melalui (3,2)dan(6,-3) adalah

(y – y1) / (y2  – y1) = (x – x1) / (x2 – x1)
(y – 2) / (-3 -2) = (x – 3) / (6 – 3)
(y – 2) / (-5) = (x – 3) / 3
3 (y – 3) = (-5) . (x – 3)
3y – 9 = -5x + 15
5x + 3y = 15 + 9
5x + 3y = 24