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Math Help - Need help solving this equation...! (please) :D

  1. #1
    Newbie
    Joined
    Dec 2007
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    Exclamation Need help solving this equation...! (please) :D

    my algebra teacher barely speeks a word of english and her way of explaining things is difficult to understand, so i thought i'd ask u guys!

    I tried and this is what i got!

    Find value of X

    X + X/10 = 3Y - X
    2X + X/10 = 3Y
    2X + X = 30Y
    3X = 30Y
    X = 3Y

    is that correct?? because my teacher says it isnt, but i dont understand where i went wrong! :S

    thanx a million!!
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  2. #2
    Math Engineering Student
    Krizalid's Avatar
    Joined
    Mar 2007
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    Santiago, Chile
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    3,654
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    12
    Hola

    Supongo que deseas sacar x en función de y:

    x + \frac{x}<br />
{{10}} = 3y - x \implies 2x + \frac{x}<br />
{{10}} = 3y \implies \frac{{21x}}<br />
{{10}} = 3y \implies \frac{{7x}}<br />
{{10}} = y.

    Finally x = \frac{{10}}<br />
{7}y.
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  3. #3
    Newbie
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    Dec 2007
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    Thumbs up Thank U!

    mchisimas gracias!!!
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