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Math Help - algebra substitution method with no coefficient of 1

  1. #1
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    algebra substitution method with no coefficient of 1

    http://i1209.photobucket.com/albums/...g?t=1333652905

    I'm having trouble on number 25

    I know how to use the substituition method if a variable has a coefficient of 1 or -1 but none of the coefficients here have that

    can someone please show me how to do this.
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  2. #2
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    Re: algebra substitution method with no coefficient of 1

    You have to solve one of the equations for y, and it doesn't matter which one.
    6x-7y=-4 (subtract 6x from both sides)
    -7y=-6x-4 (divide everything by -7)
    y=6x/7 + 4/7 Now you can substitute. Generally speaking Elimination would be a much easier way to solve this to avoid the fractions.
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