Persamaan garis melalui titik A (-3,4) dan B (2,-5) adalah..

(y-y1)/(y2-y1) = (x-x1)/(x2-x1)
(y-4)/(-5-4) = (x+3)/(2+3)
5y - 20 = -9x - 27
5y = -9x - 7
y = -9/5 x - 7/5

Dik:A(-3,4), B(2,-5)
Dit: Pers. garis
Jwb: y-y1/y2-y1=x-x1/x2-x1
y-4/-5-4=x-(-3)/2-(-3)
y-4/-9=x+3/5
-9x-27=5y-20
9x+5y+7=0