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Slope PS

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by aj5105 » Tue May 26, 2009 11:08 am
If line L passes through point (m,n) and (-m,-n), where m and n are not 0, which of the following must be true?

I. The slope of L is positive.

II. The slope of L is negative.

III. L exactly passes through 2 quadrants.
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by dumb.doofus » Tue May 26, 2009 11:17 am
Edited: Should be III only..
Last edited by dumb.doofus on Wed May 27, 2009 7:19 am, edited 1 time in total.
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by tdadic84 » Tue May 26, 2009 12:07 pm
i think I only...just drew a quick non-precise graph....
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by ssmiles08 » Tue May 26, 2009 12:18 pm
LOL I think its III only

(m, n) can be (5,2) which makes (-m,-n) to be (-5,-2) which would be a positive slope

(m,n) could also be (5,-2) which makes (-m,-n) to be (-5,2) which would be a negative slope.

The only thing I see sticking around is III

Please correct me if I am wrong
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by ssmiles08 » Tue May 26, 2009 12:26 pm
edited
Last edited by ssmiles08 on Tue May 26, 2009 12:27 pm, edited 1 time in total.
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by raleigh » Tue May 26, 2009 12:26 pm
Slope is n/m so the line is y =(n/m)x + b. plug in (m,n) and we get that b = 0.

So y = (n/m)x. Since neither n and m are non zero, it must pass through exactly two quadrants.

The answer is III.
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by PAB2706 » Wed May 27, 2009 1:31 am
I think III only.....

wht is the answer btw :?:
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