GMAT Prep Problem...please explain

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GMAT Prep Problem...please explain

by ankit1383 » Tue Sep 16, 2008 8:38 pm
In the rectangular coordinate system ,does the line intersect quadrant II

1) The slope of line is -1/6

2) The Y intercept of k is -6

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by ed09 » Tue Sep 16, 2008 10:01 pm
As for me the answer should be A. That is, if a line has a negative slope this line will finally reach the 2-nd quadrant. However, if we just know the line's Y intercept we can just tell that the line is not parallel to the Y axis, but it we don't know where it is going.
Correct me, if I'm wrong, please.

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OA A

by ankit1383 » Tue Sep 16, 2008 10:29 pm
Can you please explain in detail ...........regarding slope and intercept please......................

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by shalen78 » Tue Sep 16, 2008 10:37 pm
I would say that A is insufficient. The line could start in Quadrant I, cross through IV, and into III without ever going through II. We dont know any of the possible intercepts in order to be able to use the slope to figure out where the line may or may not be crossing.

B is insufficent because we dont know the slope of the line cant tell which direction it is going (it could be a straight horizontal line going -6, never crossing into Quadrant II, or it could be a diagonal starting in II, passing through III and the y intercept into IV)

If we take the two together then we have the slope, and y intercept and can actually map out a line and figure out if it passes through Quadrant II.

***After reading the explanation, I should have probably realized that if a line crosses through quadrants I, IV and III, it has a positive slope....sorry guys...and thanks!
Last edited by shalen78 on Wed Sep 17, 2008 12:05 pm, edited 1 time in total.

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Hi

by ankit1383 » Wed Sep 17, 2008 5:46 am
Original Answer A
Please explain in detail.........................

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by mals24 » Wed Sep 17, 2008 9:35 am
great explanation by Stuart for this ques check the following link:

https://www.beatthegmat.com/gmat-prep-te ... 10544.html