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Verified answer
M = - ⅓Persamaannya :
y - y₁ = m(x - x₁)
y - 6 = - ⅓ (x + 9) [x -3]
-3y + 18 = x + 9
x + 3y - 9 = 0
atau
3y + x - 9 = 0 [A]