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    Umpalumpa's Avatar
    Umpalumpa Posts: 6, Reputation: 1
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    #1

    Jun 24, 2008, 08:30 AM
    Substitution & Elimination Problems
    Im a little confused on how to solve these problems. Usually when I see examples it helps me to learn. HELP ME PLEASE!

    3x - 2y = 2
    -10x - 2y = 8

    How would I solve this, elimination or substitution, and how would I do it :S?
    iamthetman's Avatar
    iamthetman Posts: 105, Reputation: 8
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    #2

    Jun 24, 2008, 10:52 AM
    Substitution:

    Rearrange first equation: 3x - 2 = 2y
    Then substitute into second equation: -10x - (3x - 2) = 8
    Then group like terms and solve: -13x = 6 -> x = -6/13
    Throw x back into one of the original equations and solve for y = -22/13
    iamthetman's Avatar
    iamthetman Posts: 105, Reputation: 8
    Junior Member
    		  
    #3

    Jun 24, 2008, 10:55 AM
    Elimination:

    Multiply the entire second equation by -1 to get: 10x + 2y = -8

    Now add equation one and the new equation two together to get:
    13x = -6 -> x = -6/13
    Throw x back into one of the original equations and solve for y = -22/13
    tballard's Avatar
    tballard Posts: 1, Reputation: 1
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    #4

    Dec 1, 2008, 05:17 AM

    I need help solving this by substitution and elimination
    3x-2y=8
    -12x+8y=32
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #5

    Dec 3, 2008, 02:28 AM

    Hello tballard. Please start another thread for your question.
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