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September 19, 2014

September 19, 2014

Posted by **14** on Saturday, September 25, 2010 at 7:27am.

- geometry -
**Reiny**, Saturday, September 25, 2010 at 8:02amIf the slopes of the lines are equal, the lines are parallel

if the slopes are negative reciprocals of each other, the lines are perpendicular, ( e.g. 5/3 vs -3/5)

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