Reflection about the y axis negates each of the x values.

A' = (-1, 4)

B' = (-4, 4)

C' = (-4, 1)

D' = (-1, 1)

A' = (-1, 4)

B' = (-4, 4)

C' = (-4, 1)

D' = (-1, 1)

A' = (-1, 4)

B' = (-4, 4)

C' = (-4, 1)

D' = (-1, 1)

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