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(x,y) dicerminkan thp x = 2 maka bay = (2.2 - x, y) = (4 - x, y)
artinya 4 - x = x' => x = 4 - x' dan y = y'
jadi bayangan dr 1 + y - 3x = 0 adalah
=> 1 + y' - 3(4 - x') = 0
=> 1 + y' - 12 + 3x' = 0
=> 3x + y - 11 = 0