SOLUTION: Two lines are perpendicular when (1 point)

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Question 520751: Two lines are perpendicular when (1 point)
Found 2 solutions by nerdybill, Alan3354:
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
when their slopes are "negative reciprocal" of each other

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
the product of their slopes is -1