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x' = x + a
y' = y + b
x' = -6 + (-4)
y' = 7 + 5
x' = -10
y' = 12
koordinat bayangan pertama : (-10, 12)
x' = -10 + 9
y' = 12 + (-2)
x' = -1
y' = 10
koordinat bayangan kedua : (-1, 10)
Jadi bayangan titik D ada di (-1, 10)