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April 2, 2015

April 2, 2015

Posted by **Cathy** on Wednesday, December 8, 2010 at 10:58pm.

- Algebra -
**Reiny**, Wednesday, December 8, 2010 at 11:00pmTheir slopes are opposite reciprocals

e.g.

if one line has a slope of 2/5, then its perpendicular has a slope of -5/2

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