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R (O, 180⁰)
(x,y) -------------→ (-x, -y)
Translasi oleh (5,2)
T (5, 2)
(x,y) -------------→ (x + 5, y + 2)
Apabila digabung, maka :
R (O, 180⁰) T (5, 2)
(x,y) -------------→ (-x, -y) -----------→ (-x + 5, -y + 2)
x' = -x + 5
x = 5 - x'
y' = -y + 2
y = 2 - y'
Masukkan nilai x dan y yang didapat ke persamaan garis awal :
y = 2x + 3
2 - y' = 2(5 - x') + 3
2 - y' = 10 - 2x' + 3
2 - 10 - 3 + 2x' = y'
-11 + 2x' = y'
y' = 2x' - 11
y = 2x - 11
Jadi, bayangan garisnya adalah y = 2x - 11