persamaan garis melalui titik (3,-2) dan (4,1)

y-y1/y2-y1 = x-x1/x2-x1
y-(-2)/1-(-2) = x-3/4-3
y+2/3 = x-3/1
y+2 = 3(x-3)
y+2 = 3x-9
y = 3x-9-2
y = 3x-11

*semoga membantu. sukses selalu ^_^