persamaan garis yang melalui titik (0,2) dan (5,0) adalah..

(y - 2)/(0 - 2) = (x - 0)/(5 - 0)
(y - 2)/-2 = x/5
5y - 10 = - 2x
2x + 5y - 10 = 0

(y-y1)/(y2-y1)=(x-x1)/(x2-x1)
(y-2)/(0-2)=(x-0)/(5-0)
5y-10=-2x
y-2=-2x/5
y=-2x/5+2