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y + 4x = 1
4x + y = 1
Mencari gradien ~> m = -a/b
= -4/1
= -4
Syarat garis tegak lurus ~> m₁ × m₂ = -1
Mencari m₂ ~> m₁ × m₂ = -1
-4 × m₂ = -1
m₂ = 1/4
Persamaan ~> y - y₁ = m(x - x₁)
y - 6 = 1/4(x - (-2))
y - 6 = 1/4(x + 2)
y - 6 = 1/4x + 1/2
y = 1/4x + 1/2 + 6
4y = x + 2 + 6
4y = x + 8
y = 1/4x + 2
Jadi, persamannya adalah y = 1/4x + 2