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Math Help - Equations: Where am I going wrong?

  1. #1
    Junior Member Turple's Avatar
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    Smile Equations: Where am I going wrong?

    2x/3-x/4=5
    *12=

    3*4*2x/3=8x

    3*4*x/4=3x

    5*12=60

    8x-3x=60

    5x=60

    /5=x=12

    Help! I got 12 but it doesn't seem to fit in. Unless I'm just being stupid :/

    And this one:

    2x-1/6+x+3/3=5/2

    *6=1*6*2x-1/2=2x-1

    2*3*x+3/3=2x+6

    2*3*5/2=15

    =4x+5=15

    -5=4x=10

    /4=x=2.5

    Thanks

    Laura
    Last edited by Turple; November 22nd 2007 at 07:29 AM. Reason: Needed to add more
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  2. #2
    Bar0n janvdl's Avatar
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    Quote Originally Posted by Turple View Post
    2x/3-x/4=5
    *12=

    3*4*2x/3=8x

    3*4*x/4=3x

    5*12=60

    8x-3x=60

    5x=60

    /5=x=12

    Help! I got 12 but it doesn't seem to fit in. Unless I'm just being stupid :/

    And this one:

    2x-1/6+x+3/3=5/2

    *6=1*6*2x-1/2=2x-1

    2*3*x+3/3=2x+6

    2*3*5/2=15

    =4x+5=15

    -5=4x=10

    /4=x=2.5

    Thanks

    Laura
    I assume you mean: \frac{2x}{3} - \frac{x}{4} = 5

    12 ( \frac{2x}{3} - \frac{x}{4} ) = 12( 5 )

    8x - 3x = 60

     5x = 60

     x = 12 (You were correct! Good Job)


    -----------

    Second one:

    2x-1/6+x+3/3=5/2

    \frac{2x - 1}{6} + \frac{x + 3}{3} = \frac{5}{2}

    6 (\frac{2x - 1}{6} + \frac{x + 3}{3}) = 6( \frac{5}{2} )

    2x - 1 + 2(x + 3) = 15

    4x + 5 = 15

    x = 2,5 (Correct again! Seems like you got the idea! )
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  3. #3
    Junior Member Turple's Avatar
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    Xd

    Oh ok thanks I guess I just wasn't checking them properly.
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  4. #4
    Bar0n janvdl's Avatar
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    Quote Originally Posted by Turple View Post
    Oh ok thanks I guess I just wasn't checking them properly.
    You're welcome. You seem to have it all under control
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