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m = y2 - y1 / x2 - x1
-2 = -4 - 8 / 3a - 5a
-2 = -12 / -2a
-2 . -2a = -12
4a = -12
a = -3
Jadi koordinat titik
A (5.-3, 8) = A (-15, 8)
B (3.-3, -4) = B (-9, -4)