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Math Help - Solve Using The Substitution Method

  1. #1
    Newbie Ai Ekio's Avatar
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    Solve Using The Substitution Method

    Help?

    x - 6y= 64
    7y - 4x= -84

    I think one reason I'm having problems with it is every time I work it out,I get fractions and I'm not sure how to figure it.
    And also :
    0.1x + 0.5y= -2.4
    0.4x - 0.2y= 3.6
    Help very appreciated!
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  2. #2
    MHF Contributor
    skeeter's Avatar
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    Quote Originally Posted by Ai Ekio View Post
    Help?

    x - 6y= 64 ... x = 6y + 64 ... sub into the second equation for x

    7y - 4x= -84 ... 7y - 4(6y + 64) = -84 ... solve for y


    0.1x + 0.5y= -2.4 ... multiply every term in both equations by 10 to clear the decimals, isolate x in the 1st equation, sub the result into the 2nd equation. same drill.
    0.4x - 0.2y= 3.6
    ...
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