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Math Help - Proving an inequality #2.

  1. #1
    rcs
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    Proving an inequality #2.

    Given that a and b are positive numbers, c and d are negative numbers, and a > b, c > d, then show that a/c < b/d
    Last edited by mr fantastic; August 12th 2010 at 05:00 AM. Reason: Re-titled.
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by rcs View Post
    Given that a and b are positive numbers, c and d are negative numbers, and a > b, c > d, then show that a/c < b/d
    This is equivalent to showing that for u,v,w,x all positive with u>v and w<x that u/w>v/x

    CB
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    rcs
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    sir i'd like to see how it is being done... i mean the proof.. the sequence of the it's proof. thanks
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    Wouldn't it be better to learn how to do it yourself? You learn mathematics by doing mathematics. Not by watching someone else do mathematics.

    If c> d and c is negative, then 1< d/c. Do you see why? If d is also negative then 1/d> 1/c. That's what you need to do to prove this.
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  5. #5
    rcs
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    i needed help from you sir becoz i dnt know how... it was given us as assignment... sorry
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  6. #6
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    Quote Originally Posted by rcs View Post
    i needed help from you sir becoz i dnt know how... it was given us as assignment... sorry
    In that case, your teacher will expect the solution you hand in to be your work, not someone elses work.

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