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5y = -4x +10
y = -4/5x +10/5
y = -4/5x +2
Maka, m₁ = -4/5
m₁ . m₂ = -1
-4/5 . m₂ = -1
m₂ = -1 per -4/5
m₂ = 5/4
y -y₁ = m(x -x₁)
y -(-2) = 5/4(x -1)
y +2 = 5/4x -5/4 dikali 4 untuk menghilangkan penyebut, sehingga
4y +8 = 5x -5
4y = 5x -5 -8
4y = 5x -13
5x -4y -14 = 0
Itu jawabannya.
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