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Slope products (Posted on 2011-11-08) Difficulty: 1 of 5
It is a well known result from algebra that if two lines are perpendicular then the product of their slopes is always -1.*

Give a very simple proof that if the lines form any angle besides 90o the product of the slopes cannot be a constant.

*Assuming neither line is vertical.

See The Solution Submitted by Jer    
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Some Thoughts re: Solution Comment 3 of 3 |
(In reply to Solution by Paul)

Original and nicely presented!
  Posted by Ady TZIDON on 2011-11-09 03:55:20

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