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DS question

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magical cook Master | Next Rank: 500 Posts Default Avatar
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DS question

Post Tue Feb 13, 2007 8:47 pm
Hello.

If X is not = -y, is x-y/x+y > 1?

1) x>0
2) y<0

The answer is E. However, I originally thought the answer would be B because  x-y/x+y > 1 → x-y> x+1 and when Y is Y<0, it's valid whether X is X<0 or X>0.

BUT, I had a second thought if x-y/x+y > 1 → x-y> x+1 is possible..... (I am away from math for a long time....now I am not too sure if we can divide both sides in inequality expression )


Thanks,
R.

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magical cook Master | Next Rank: 500 Posts Default Avatar
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Top Reply
Post Tue Feb 13, 2007 10:18 pm
Thanks Mark for the explanation.

I agree for inequality question, the first step we should do is rewriting them. your explanation clears out my doubt.

Thanks again for your help.
Very Happy

Rina

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Post Tue Feb 13, 2007 9:43 pm
hi magical cook,

see if the explanation in the attached image helps.

Mark
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