How to Cite "Slopes of Parallel and Perpendicular Lines" from CliffsNotes.com:

CliffsNotes.com. Slopes of Parallel and Perpendicular Lines. 23 Sep 2014
<http://www.cliffsnotes.com/math/algebra/algebra-ii/segments-lines-and-inequalities/slopes-of-parallel-and-perpendicular-lines>.



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