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GMAT Prep #2 DS: If x and y are integers and x>0, is y>0?

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judychuang
 Post subject: GMAT Prep #2 DS: If x and y are integers and x>0, is y>0?
 Post Posted: Fri Dec 17, 2010 2:06 pm 
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Course Students


Posts: 1
If x and y are integers and x>0, is y>0?

1) 7x-2y>0
2) -y<x

Answer is E

I searched the forum, and couldn't find an explanation.

Help?

Thanks!


Last edited by judychuang on Sat Jan 08, 2011 5:17 pm, edited 1 time in total.

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jnelson0612
 Post subject: Re: GMAT Prep #2 DS: If x and y are integers and x>0, is y>0?
 Post Posted: Sat Dec 18, 2010 9:46 am 
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ManhattanGMAT Staff


Posts: 1857
judychuang wrote:
If x and y are integers and x>0, is y>0?

1) 7x-2y>0
2) -y>x

Answer is E

I searched the forum, and couldn't find an explanation.

Help?

Thanks!


Hi Judy!
Are you sure that this problem is written correctly? With statement 1, we can plug numbers and find that y could be both positive or negative, so statement 1 would be insufficient.

However, statement 2 says -y>x. If we know that x is positive, then y MUST be negative to allow y to be greater than x after the additional negative sign is applied. I cannot think of another situation in which anything else could be the case.

Please let us know--thanks!

_________________
Jamie Nelson
ManhattanGMAT Instructor
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