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Reflections of a line

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by gmatboost » Fri Aug 12, 2011 7:49 am
The basic things to know about reflections in general (not just lines) are:

Reflection over the y-axis means you should flip the sign of x-coordinates.
Reflection over the x-axis means you should flip the sign of y-coordinates.
180 degree rotation means you should flip the sign of both coordinates.
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