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Math Help - linear equations by addition method

  1. #1
    Mjf
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    linear equations by addition method

    I'm usually pretty decent doing these problems, but one is stumping me for some reason. I'm drawing a blank on the following turning the fraction into a simple line formula to solve with. It goes like this.

    x over 3 plus y over 3 equals 0 so x/3 + y/3 = 0 is the first one and the second is 10x + 5y = -1
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  2. #2
    MHF Contributor MarkFL's Avatar
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    Re: linear equations by addition method

    Multiply the first equation by -15, then add it to the second equation to eliminate y.
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  3. #3
    Mjf
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    Re: linear equations by addition method

    thanks alot
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  4. #4
    Mjf
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    Re: linear equations by addition method

    What would you do with a problem like y=5/3x so y = 5 over 3 times x and your second would be x+y=2
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  5. #5
    MHF Contributor MarkFL's Avatar
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    Re: linear equations by addition method

    I would multiply the first equation by 3 and arrange as:

    5x-3y=0

    and multiply the second equation by 3 to get:

    3x+3y=6

    then add to eliminate y.
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  6. #6
    Mjf
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    Re: linear equations by addition method

    awesome that makes sense thanks
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