SOLUTION: How can you determine if two lines are perpindicular?

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Question 139329: How can you determine if two lines are perpindicular?
Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
Find their slopes. Then see if those slopes, when multiplied together, equal -1.
If they do, the lines are Perp. If not, then lines are not Perp.