titik R(1,-3) dan sejajar dengan garis yang melalui titik A(4,1) dan B(-1,2)

x1=4, x2=-1, y1=1, y2=2

[(y-y1)/(y2-y1)] = [(x-x1)/(x2-x1)]
[(y-1)/(2-1)] = [(x-4)/(-1-4)]
[(y-1)/1] = [(x-4)/(-5)]
(-5)(y-1) = 1(x-4)
-5y +5 = x-4
-5y = x-4-5
-5y = x-9
y = -1/5 x + 9/5

m1 = -1/5

m1 = m2 = -1/5

R(1,-3)
y-y1 = m (x-x1)
y-(-3) = -1/5 (x-1)
y+3 = -1/5 x + 1/5
y = -1/5 x + 1/5 - 3
y = -1/5 x + 1/5 - 15/5
y = -1/5 x - 14/5
5y = -x -14