Melalui (-2,1). Dan tegak lurus dengan garis yangbmelalui ttik (-5,-4) dan (0,-2)

m1 = -2 - (-4)/0 - (-5)
m1 = -2 + 4/0 + 5
m1 = 2/5
m1 × m2 = -1
2/5 × m2 = -1
m2 = -1/2/5
m2 = -1 × 5/2
m2 = -5/2
y - y1 = m(x - x1)
y - 1 = -5/2(x - (-2))
y - 1 = -5/2(x + 2)
2(y - 1) = -5(x + 2)
2y - 2 = -5x - 10
2y + 5x = -10 + 2
2y + 5x = -8