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GMAT Prep?? Another Coordinate Geometry...


 
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dferm
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PostPosted: Fri May 09, 2008 1:57 pm    Post subject: GMAT Prep?? Another Coordinate Geometry... Reply with quote
Please Help..

Thanks.
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mim3
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PostPosted: Fri May 09, 2008 2:20 pm    Post subject: Re: GMAT Prep?? Another Coordinate Geometry... Reply with quote
dferm wrote:
Please Help..

Thanks.


So, the only way that a line will NOT venture into quadrant II is if:

1. The line has a positive slope. Any line with a negative slope will, at some point, go into quad II.

and...

2. The line has a negative y-intercept. If it's positive, it will go into quad II regardless of the slope.

So, applying that to what's given.

1) k has a negative slope. Great, we know it will hit quad II. Sufficient.
2) So, y-int is negative, but we don't know anything about the slope. Negative, it goes into quad II. Positive, it doesn't. Insufficient.

Answer is A. Hope that's helpful.
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