Which point would map onto itself after a reflection across the line y = –x? (–4, –4) (–4, 0) (0, –4) (4, –4)

The answer
first, put all point on the figure, and then trace graphe of y = -x
after, that we should find the image of each point, after a reflection across the line y = -x.
and we should find that the point would map onto itself after a reflection is        (–4, –4)

for more explanation, please look at the image. 

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