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3y = x - 5
m = 1/3
Karna tegak lurus, maka m1*m2 = -1
(1/3)*m2 = -1
m2 = -3
y - b = m(x - a)
y + 3 = -3(x - 5)
y + 3 = -3x + 15
y = -3x + 12