Coordinate Rules for Reflections

In general, the following coordinate rules for reflections can easily be established:

Reflection in x-axis:  (x, y) --> (x, –y)

Reflection in y-axis:  (x, y) --> (–x, y)

Reflection in y = x:  (x, y) --> (y, x)

Reflection in y = –x:  (x, y) --> (–y, –x)

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