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P (y = k)
(x,y) ----------→ (x, 2k - y)
Maka, apabila y = 3, akan menjadi :
P (y = 3)
(x,y) ----------→ (x, 6 - y)
x = x'
6 - y = y'
y = 6 - y'
Masukkan x dn y ke persamaan garis awal
y = -x + 2
6 - y' = -x' + 2
6 + x' - 2 = y'
4 + x' = y'
y' = x + 4
y = x + 4
Jadi, bayangan garisnya adalah y = x + 4