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Garis Lurus.Hitung dulu gradien garis PQ!
m = Δy / Δx
= (-3 - 5) / (2 + 2) = -2
m = Δy' / Δx'
-2 = (9 + 3) / (x - 2)
x - 2 = 12 / -2
x = -4