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E¹ = ( -22 , -6 )
E¹ = ( -22 , -6 ) direfleksi y = 7 = E¹¹ = ( a ,2k - b )
E¹¹ = ( -22 , 2 .7 - (-6) )
E¹¹ = ( -22 , 14 + 6 )
E¹¹ = ( -22 ,20 )
x' = x + a
y' = y + b
x' = -12 + (-10)
y' = 9 + (-15)
x' = -22
y' = -6
koordinat = (-22, -6)
refleksi y = b
x' = x
y' = 2b - y
x' = -22
y' = 2(7) - (-6)
x' = -22
y' = 14 + 6
x' = -22
y' = 20
koordinat bayangan titik E = (-22, 20)