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Coordinate geometry DS

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akshay.jashnani
 Post subject: Coordinate geometry DS
 Post Posted: Sun Nov 28, 2010 8:33 pm 
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Course Students


Posts: 1
If ab not equal to 0, points (-a,b) and (-b,a) are in the same quadrant of the xy-plane, is (-x,y) in this same quadrant?

(1) xy > 0
(2) ax > 0

I am not really sure how to approach this problem. Its evident that the slope of the line that passes through (-a,b) and (-b,a) is 1 but is knowing that even useful?

Thanks!
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jnelson0612
 Post subject: Re: Coordinate geometry DS
 Post Posted: Mon Nov 29, 2010 3:09 pm 
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ManhattanGMAT Staff


Posts: 1857
Akshay,
Do you have an answer to this question?

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Jamie Nelson
ManhattanGMAT Instructor
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rite2deepti
 Post subject: Re: Coordinate geometry DS
 Post Posted: Wed Dec 01, 2010 10:33 am 
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Students


Posts: 3
OA is C
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RonPurewal
 Post subject: Re: Coordinate geometry DS
 Post Posted: Thu Dec 02, 2010 9:38 am 
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ManhattanGMAT Staff


Posts: 7146
big fat discussion of this one here
if-ab-does-not-equal-zero-t2975.html
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