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5x - 4y = 5(1) - 4(-2)
5x - 4y = 5 + 8
5x - 4y = 13
atau
5x - 4y - 13 = 0
yang -10 = 0 tidak diperlukn
⇒ 5y = -4x + 10
⇒ y = (-4/5)x + 2
⇒ m1 = -4/5
karena tegak lurus, maka berlaku
(m1)(m2) = -1
⇒ (-4/5)(m2) = -1
⇒ m2 = 5/4
Sehingga
(1, -2) ⇒ a = 1, b = -2
y - b = (m2)(x - a)
⇒ y - (-2) = (5/4)(x - 1)
⇒ 4(y + 2) = 5(x - 1)
⇒ 5x - 5 = 4y + 8
⇒ 5x - 4y - 13 = 0
Terimakasih semoa membantu