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Mathematics 16 Online
OpenStudy (anonymous):

How do I determine if the slopes 3 and -1/3 are perpendicular or parallel?

jimthompson5910 (jim_thompson5910):

if the slopes are equal, then you have 2 parallel lines

jimthompson5910 (jim_thompson5910):

if the two slopes multiply to -1, then you have 2 perpendicular lines

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