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

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Question 256122: How can you determine if two lines are perpendicular?
Answer by EMStelley(208) About Me  (Show Source):
You can put this solution on YOUR website!
Two lines are perpendicular if their slopes are opposite reciprocals of each other.
Example:
y=2x+9
y=(-1/2)x-3