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Math Help - Math proof help

  1. #1
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    Math proof help

    This is probably terribly easy for most of you, but I am stuck on a proof, maybe someone could help me!

    Prove: a,b are R. If a<b, then -b<-a.

    Would I use the additive inverse here?
    l
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  2. #2
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    Quote Originally Posted by jujab View Post
    This is probably terribly easy for most of you, but I am stuck on a proof, maybe someone could help me!

    Prove: a,b are R. If a<b, then -b<-a.

    Would I use the additive inverse here?
    l
    I assume you mean the fact that a+ (-a)= 0. Yes, add a+ b to both sides of the inequality.
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  3. #3
    Super Member Matt Westwood's Avatar
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    Quote Originally Posted by HallsofIvy View Post
    I assume you mean the fact that a+ (-a)= 0. Yes, add a+ b to both sides of the inequality.
    Do you mean add -(a+b) to both sides of the inequality?
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