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Verified answer
P(x,y) = (8,7)D{(2,1), 2)
x' - 2 = 2(x -2) →x' = 2x - 4 + 2
x' = 2x - 2 → x' = 2(8) - 2
x' = 14
y' - 1 = 2(y-1) →y' = 2y - 2 + 1
y' = 2y - 1 → y' = 2(7) - 1
y' = 13
Rx → x" = x' → x " = 14
y" = -y' → y" = - 13
T(12) → x"' = x" + 1 = 14+1 = 15
y"' = y" + 2 = -13 + 2 = - 11
bayangan (x"', y"') = (15, -11)