Posted by amy on Thursday, May 31, 2012 at 2:39pm.
Reflection about the y-axis has the transformation defined as:
T(x,y)→(-x,y).
For example, the point (5,4) reflected about the y-axis becomes (-5,4), according to the rule.
Apply the rule to all three vertices (in the same order) of the given triangle to get the image.
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