Tentukan persamaan garis yang melalui titik A(2,3) B(1,5)

jwb:
(y-y1)/(y2-y1)=(x-x1)/(x2-x1)
(y-3)/(5-3)=(x-2)/(1-2)
(y-3)/(2)=(x-2)/(-1)
-y+3=2x-4
-y=2x-4-3
-y=2x-7
------------dikali (-1)
y=-2x+7