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2y = -4x + 8
y =
y = -2x + 4
m = -2
Syarat m₁ = m₂
m₂ = -2
Persamaan garis melalui titik (0, -5) dengan m = -2
y - y₁ = m(x - x₁)
y - (-5) = -2(x - 0)
y + 5 = -2x + 0
y + 5 = -2x
y = -2x - 5