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Points on a quadrant

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by Patrick_GMATFix » Mon Jul 12, 2010 5:07 am
This question is a bit challenging because it disguises itself as a geometry question when it's really a number properties question.

Two points can be in the same quadrant only if the x coordinates have the same sign and the y coordinates have the same sign. So this question is asking: Is (-x) of the same sign as (-a) and (-b)? Also is y of the same sign as a and b?

For (-x) to have the same sign as (-a) and (-b), x, a and b must have the same sign. Essentially we're asked whether all variables have the same sign.

The correct answer is C.

To better understand, have a look at the video solution. This is GMATPrep question 1043. To practice similar questions, set topic='Geometry, Coordinate' and difficulty='600-700' in the drill generator

-Patrick
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by gmatruler » Sun Jul 18, 2010 6:28 am
The OA is C. Thanks Patrick. Explanation and video solution are very helpful.
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