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Math Help - Systems of equations

  1. #1
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    Dec 2010
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    Systems of equations

    I think I'm doing the steps right but I'm not turning out with the right answer.. ): help?



    2a-7b=-12 and -a+4b=7

    Substituting method is the way im doing it.
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  2. #2
    MHF Contributor
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    2a-7b=-12

    -a+4b=7\Rightarrow  a=4b-7

    2(4b-7)-7b=-12

    8b-14-7b=-12

    b=2
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