SOLUTION: How can you recognize if two lines are perpendicular on a graph?

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Question 425783: How can you recognize if two lines are perpendicular on a graph?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
How can you recognize if two lines are perpendicular on a graph?
They are perpendicular if the product
of their slopes is -1.
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Example:
If one slope = 2/3
and the other is -3/2
the lines are perpendicular.
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Cheers,
Stan H.
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