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⇔ (x₁, y₁) → (-2, -1)
⇔ (x₂, y₂) → (1, 8)
≡ Menentukan Persamaan Garis:
⇔ (y - y₁) / (y₂ - y₁) = (x - x₁) / (x₂ - x₁)
⇔ (y - (-1)) / (8 - (-1)) = (x - (-2)) / (1 - (-2))
⇔ (y + 1) / 9 = (x + 2) / 3
⇔ 9(x + 2) = 3(y + 1)
⇔ 9x + 18 = 3y + 3 [÷3]
⇔ 3x + 6 = y + 1
⇔ y = 3x + 5