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    Jherek's Avatar
    Jherek Posts: 1, Reputation: 1
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    #1

    Jun 26, 2012, 11:32 AM
    solving for a variable
    2bc+bd-b+3=-4c-4 solve for b.
    My answer was: b=(-4c-7)/2c+d-1
    The answer should have been: b=(4c+7)/-2c+d-1
    I know that they multiplied by -1 to get the proper answer, but I really just don't understand WHY?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Jun 26, 2012, 12:14 PM
    Actually, they didn't multiply by -1 to get the proper answer and your answer is fine like it is. It's just that the other is a little more... 'elegant' one might say. They actually multiplied by 1.



    Remember that -1/-1 = 1
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