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camitava
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 Posted: Wed May 14, 2008 8:57 am Post subject: GMATPrep DS - 10 |
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Require explanation for why not D but A? Obviously OA is A. The question is -
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gabriel
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| Posted: Wed May 14, 2008 11:07 am Post subject: Re: GMATPrep DS - 10 |
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| camitava wrote: | Require explanation for why not D but A? Obviously OA is A. The question is -
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The second statement says nothing about the x intercept of the line nor does it say anything about the slope. Along with the y intercept you need atleast one of the above information to decide in which quadrant the line will fall in. Hence the answer is A. |
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camitava
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| Posted: Wed May 14, 2008 9:27 pm Post subject: |
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| Quote: | | The second statement says nothing about the x intercept of the line nor does it say anything about the slope. Along with the y intercept you need atleast one of the above information to decide in which quadrant the line will fall in. Hence the answer is A. |
Gabriel, the question is asking for the fact whether the line intersects quadrant -II. Now to intersect quadrant-II, the line should pass thru origin. But the line is having -6 as its Y-intercept. So we can say that the line is not passing thru origin. Hence the line is not intercepting the quadrant - II.
Hey Gabriel, am I missing something here?
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wawatan
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| Posted: Thu May 22, 2008 10:32 pm Post subject: |
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| basically an intercept with a -6 can intersect the quadrant II section with a negative slope. however it can also have a positive slope with the intercept of -6 and will not intersect the quandrant II. therefore the statement is insufficient. |
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rdadbhawala
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| Posted: Thu May 22, 2008 11:45 pm Post subject: Properties of slopes |
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Except for Slope = 0 (x axis or parallel) OR undefined (y axis or parallel), we can say that a positive slope always passes through quadrants I & III, a negative slope will always pass through quadrants II and IV. Passing through the other quadrants is not guaranteed.
The second statement is insufficient as just knowing the intercept guarantees that the quadrants III and IV are intersected, but not quadrant I or II unless we know some other info like slope or x intercept.
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