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

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

Algebra.Com

Question 256122: How can you determine if two lines are perpendicular?
Answer by EMStelley(208) (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
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