Discussion:  Roundtable 
Topic:  perpendicular lines 
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Subject:  perpendicular lines 
Author:  lonnie 
Date:  Dec 10 2003 
I'm sorry to be so dumb but it's been too long since I've done any of this. I'm
helping my son with his math .
line p:y=1/5x=2 q:y=5x1/2 r:y5x+3
Which of these lines are perpendicular?
please tell me why
Thanks.
 
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