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y - (-5) = (1/3)(x - 9)
y + 5 = (1/3)(x - 9)
3(y + 5) = x - 9
3y + 15 = x - 9
3y = x - 24
3y - x + 24 = 0
↔ Gradien (m) → ¹/₃
↔ (x₁, y₁) → (9, -5)
≡ Menentukan Persamaan Garis:
⇒ y - y₁ = m(x - x₁)
⇒ y - (-5) = ¹/₃ (x - 9) [×3]
⇒ 3(y + 5) = x - 9
⇒ 3y + 15 = x - 9
⇒ x - 3y - 24 = 0