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M (x = k)
(x,y) ------------→ (2k - x, y)
M (y = h)
(x,y) ------------→ (x, 2h - y)
Maka, untuk soal ini :
M (x = 5) M (y = -4
(x,y) ------------→ (10 - x, y) ------------→ (10 - x, -8 - y)
x' = 10 - x
= 10 - 3
= 7
y' = -8 - y
= -8 - 4
= -12
Maka, bayangan titik (3,4) adalah (7, -12)