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DS question

This topic has 2 member replies
magical cook Master | Next Rank: 500 Posts Default Avatar
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DS question

Post Tue Feb 13, 2007 8:47 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    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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    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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    magical cook Master | Next Rank: 500 Posts Default Avatar
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    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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