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y = 1/2 x +1
gradien = 1/2
gradien tegak lurusnya = -2
y - (-3) = -2(x -4)
y + 3 = -2x +8
y = -2x + 5
y = 2/4 x +4/4
y = 2/4 x +1
m₁ = 2/4
m₁ . m₂ = -1
2/4 . m₂ = -1
m₂ = -1 per 2/4
m₂ = -4/2
y -y₁ = m(x -x₁)
y -(-3) = -4/2(x -4)
y +3 = -4/2 x +16/2
y +3 = -4/2 x +8 dikali 2 untuk menghilangkan penyebut, sehingga
2y +6 = -4x +16
2y = -4x +16 -3
2y = -4x +13