in a 50 word response how can you determine if two lines are perpendicular?

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Originally Posted by kidsdomain in a 50 word response how can you determine if two lines are perpendicular? Their gradients have a product of -1.

Originally Posted by kidsdomain in a 50 word response how can you determine if two lines are perpendicular? Originally Posted by Prove It Their gradients have a product of -1. That's only six words (seven if you count ha ha the number).

Originally Posted by mr fantastic That's only six words (seven if you count ha ha the number). Well I do want the OP to do SOME research Mr F :P