Posted by Patrick on Wednesday, February 27, 2008 at 2:08am.
How can you determine if two lines are perpendicular?

Algebra  Vanessa, Wednesday, February 27, 2008 at 2:53am
you can find the slope of the two lines...when it is perpendicular
m1*m2=1
m1=one of the slope
m2=the second slope
if you multiply the slopes together, you will get 1 if it is perpendicular.

Algebra  drwls, Wednesday, February 27, 2008 at 2:53am
Multiply the slope of one by the slope of the other. If the product is 1, they are perpendicular.
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