Tentukan persamaan garis yang melalui titik p(-3,8) dan O(4,5)

(x – x1) (y2 – y1) = (x2 – x1) (y – y1)
(x – (-3)) (5 – 8) = (4 – (-3)) (y – 8)
(x + 3) (-3) = (7) (y – 8)
-3x – 9 = 7y – 56
-9 + 56 = 3x + 7y
47 = 3x + 7y

jadi persamaan garisnya 3x + 7y = 47