SOLUTION: When graphing how can I determine if two lines are perpendicular.

SOLUTION: When graphing how can I determine if two lines are perpendicular.

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Question 256465: When graphing how can I determine if two lines are perpendicular.
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
Another weakness of using graphs to solve. You can't tell by graphing.
You have to use formulas.
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