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x' = x
x' = −4
y' = −y
y' = −7
Maka bayangan titik adalah (−4, −7)
b. Pencerminan garis x = 4
x' = 2a − x
x' = 2×4 − (−4)
x' = 12
y' = y
y' = 7
Maka bayangan titik adalah (12, 7)
c. Pencerminan y = −1
x' = x
x' = −4
y' = 2b − y
y' = 2×(−1) − 7
y' = −9
Maka bayangan titik adalah (−4, −9)