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Verified answer
Persamaan Garis Lurus.Persamaan garis yang melewati titik (x₁, y₁) dan tegak lurus garis ax + by = c adalah bx - ay = bx₁ - ay₁.
-x - 3y = -1(-6) - 3(-1)
-x - 3y = 9
x + 3y + 9 = 0