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November 21st, 2014, 07:35 AM   #1
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x axis and y axis Product of slopes is equal to -1

How can we prove that x axis and y axis Product of slopes is equal to -1
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November 21st, 2014, 09:00 AM   #2
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It doesn't, but you can show that the limit is -1.
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November 21st, 2014, 02:46 PM   #3
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Similarily, two lines of the form ax that have the line y = x as symmetry-axis have a product of slopes equal to 1. What about the x-and y axis?
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November 26th, 2014, 07:31 PM   #4
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Quote:
Originally Posted by Hoempa View Post
Similarily, two lines of the form ax that have the line y = x as symmetry-axis have a product of slopes equal to 1. What about the x-and y axis?
I'm not sure this helps here. The line coinciding with the y-axis is not of the form $y = ax$
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November 27th, 2014, 05:16 AM   #5
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Indeed, but to find the product of -1, isn't used that two perpendicular lines have product of slopes -1? I figured to use a similar argument.
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