Results 1 to 5 of 5
Like Tree1Thanks
  • 1 Post By biffboy

Math Help - fraction equation

  1. #1
    Newbie
    Joined
    Mar 2012
    From
    usa
    Posts
    7

    fraction equation

    this is part of a test, so if you could tell me "how" to do this that would be great!

    (x/5)-(x+3/3)=(1/15)

    like I said in the title, this is a fractional equation, I keep getting x=7 but it will not come out right when I check it.
    any thoughts???
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Oct 2009
    Posts
    5,551
    Thanks
    783

    Re: fraction equation

    First, I assume the equation is x/5 - (x + 3)/3 = 1/15 (note the parentheses around x + 3; otherwise x + 3/3 = x + (3/3) = x + 1).

    Multiply both sides by 15. Post the result and if you still have a difficulty, describe it.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Mar 2012
    From
    usa
    Posts
    7

    Re: fraction equation

    yes emakarov, sorry about the error. you could say it as "x plus three over three" and I went that route, I will post all of my work and see if you know where my flaw is.

    x/5 - (x+3)/3 = 1/15
    15(x/5) - 15([x+3]/3) = 15(1/15)
    15x/5 - (15x+45)/3 = 1
    3x - (5x+15) = 1
    (-2x) + 15 = 1
    15 = 2x + 1
    14 = 2x
    7 = x

    That looks more confusing on paper... lol but that is what I keep coming to (that 7 = x) and when I use 7 = x and check it I end up with 29/15 = 1/15 (which is quite obviously wrong... LOL)
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Senior Member
    Joined
    Mar 2012
    From
    Sheffield England
    Posts
    440
    Thanks
    76

    Re: fraction equation

    Your 5th line should be -2x-15=1
    Thanks from Drummerman
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Mar 2012
    From
    usa
    Posts
    7

    Thumbs up Re: fraction equation

    OH!!! thank you! I guess I pulled down the + instead... I got it now!!!
    Last edited by Drummerman; March 31st 2012 at 08:06 AM. Reason: got it...
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. linear equation with fraction
    Posted in the Algebra Forum
    Replies: 9
    Last Post: March 7th 2011, 01:55 AM
  2. Solving f(x) equation with a fraction
    Posted in the Algebra Forum
    Replies: 2
    Last Post: September 20th 2010, 03:00 PM
  3. Fraction Equation
    Posted in the Algebra Forum
    Replies: 1
    Last Post: June 3rd 2010, 03:33 AM
  4. fraction equation
    Posted in the Algebra Forum
    Replies: 7
    Last Post: August 31st 2007, 01:15 PM
  5. Fraction equation
    Posted in the Algebra Forum
    Replies: 1
    Last Post: November 28th 2006, 10:02 AM

Search Tags


/mathhelpforum @mathhelpforum