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4y = -5x - 3
y = -(5/4)x - 3
m₁ = -5/4
karena tegak lurus, maka m₁.m₂ = -1
m₂ = -1 / (-5/4)
m₂ = 4/5
persamaan garis baru yang melalui (2,3):
y-y1 = m₂.(x-x1)
y-3 = (4/5)(x-2)
5y-15 = 4x-8
5y = 4x+7