SOLUTION: How do you know if a line is perpindicualar
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Question 1097523: How do you know if a line is perpindicualar
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
How do you know if a line is perpindicualar [sic]
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A line has to be perpendicular to something, often another line.
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If they're in the x-y plane, their slopes are negative inverses, eg,
2 and -1/2.
If the angles at the intersection = 90 degs, they're perpendicular.
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