Results 1 to 3 of 3

Math Help - Transposition - HELP!!

  1. #1
    Newbie
    Joined
    May 2009
    Posts
    3

    Transposition - HELP!!

    HELP!!

    Can anyone help me transpose the following forumla. It's driving me crazy!

    x = 3 + ln(y/(1 - y))

    I need to make y the subject, any ideas?

    Thanks in advance
    Follow Math Help Forum on Facebook and Google+

  2. #2
    -1
    e^(i*pi)'s Avatar
    Joined
    Feb 2009
    From
    West Midlands, England
    Posts
    3,053
    Thanks
    1
    Quote Originally Posted by conners84 View Post
    HELP!!

    Can anyone help me transpose the following forumla. It's driving me crazy!

    x = 3 + ln(y/(1 - y))

    I need to make y the subject, any ideas?

    Thanks in advance
    Take 3 from both sides:

    x-3 = ln(\frac{y}{1-y})

    Raise e to both sides:

    e^{x-3} = \frac{y}{1-y}

    (1-y)(e^{x-3}) = y

    Distribute the 1-y:

    e^{x-3} - ye^{x-3} = y

    Add ye^{x-3} to both sides:

    e^{x-3} = y+ye^{x-3}

    Factor the RHS:

    y(1+e^{x-3}) = e^{x-3}

    Dividing:

    y = \frac{e^{x-3}}{1+e^{x-3}}
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    May 2009
    Posts
    3
    will this still work if i have values for x of 1,3 and 10. i have tried plugging these values in but im not getting the answer i would have expected. the value for x are supposed to be years and the value of y a probability of breakdown but y for 10 years is -1.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Transposition....
    Posted in the Algebra Forum
    Replies: 6
    Last Post: March 7th 2012, 07:47 AM
  2. Transposition Help
    Posted in the Algebra Forum
    Replies: 4
    Last Post: January 2nd 2010, 10:34 AM
  3. Help with Transposition
    Posted in the Algebra Forum
    Replies: 5
    Last Post: December 19th 2009, 01:53 PM
  4. Transposition
    Posted in the Algebra Forum
    Replies: 5
    Last Post: June 22nd 2009, 11:46 PM
  5. Help with transposition
    Posted in the Algebra Forum
    Replies: 2
    Last Post: May 14th 2009, 12:30 AM

Search Tags


/mathhelpforum @mathhelpforum