persamaan garis yang melalui titik a (-3,1) dan b(2,-2) adalah

(y-y1)/(y2-y1) = (x-x1)/(x2-x1)
(y-1)/(-2-1) = (x+3)/(2+3)
(y-1)/(-3) = (x-3)/5
5(y-1) = -3(x-3)
5y-5 = -3x+9
3x+5y-5-9=0
3x+5y-14=0