Results 1 to 4 of 4

Math Help - T of F question

  1. #1
    Junior Member
    Joined
    May 2011
    Posts
    37

    T of F question

    Back again.

    Its another transposition of formulae question that dosen't seem to be sinking in

    Make x the subject:

    5(3 - x/3) = 4(x/2 + 1) The solution should be x=3

    I could only simplify it before loosing the plot

    simplified to 15 - 5x/3 = 2x + 4....then tried multiplying both sides by 3, adding 5x and taking away 4 ending up with 11=11x which is obviously wrong.....would appreciate being told where I'm going wrong.

    Thanks
    Last edited by mr fantastic; May 14th 2011 at 03:27 PM. Reason: Deleted the whinging about clearly stated rules.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    May 2010
    Posts
    1,030
    Thanks
    28
    15 - 5x/3 = 2x + 4

    (*3 both sides)

    45 - 5x = 6x + 12

    (-12 both sides) <--- not -4 as you suggest, so this may be where you went wrong

    33 - 5x = 6x

    you finish
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Super Member
    Joined
    Nov 2007
    From
    Trumbull Ct
    Posts
    917
    Thanks
    27
    Hi komoda,
    You are making an error in the final equation.Try it again and repost if you don't get x=3. Show your final equation



    bjh
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Junior Member
    Joined
    May 2011
    Posts
    37
    Thanks guys it turned out that I didn't multiply 3 by all the terms
    Follow Math Help Forum on Facebook and Google+

Search Tags


/mathhelpforum @mathhelpforum