Results 1 to 6 of 6

Math Help - Isolating x?

  1. #1
    Newbie
    Joined
    Sep 2011
    Posts
    7

    Isolating x?

    Is it possible to isolate x in the following: f(x) = -4 +2x / 5 + x? If so, how?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,617
    Thanks
    1581
    Awards
    1

    Re: Isolating x?

    Quote Originally Posted by Dmiller93 View Post
    Is it possible to isolate x in the following: f(x) = -4 +2x / 5 + x? If so, how?
    Not sure of the question??
    If y=\frac{-4+2x}{5+x} then it is possible to write x as a function of y.

    Is that the same as your question?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Sep 2011
    Posts
    7

    Re: Isolating x?

    Yes, it's the same.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,617
    Thanks
    1581
    Awards
    1

    Re: Isolating x?

    Quote Originally Posted by Dmiller93 View Post
    Yes, it's the same.
    From reply #2, just solve that equation for x in terms of y.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Sep 2011
    Posts
    7

    Re: Isolating x?

    Sorry, could you clarify? I'm not quite sure how to go about doing that.
    Follow Math Help Forum on Facebook and Google+

  6. #6
    MHF Contributor Siron's Avatar
    Joined
    Jul 2011
    From
    Norway
    Posts
    1,250
    Thanks
    20

    Re: Isolating x?

    Rewrite:
    y=\frac{-4+2x}{5+x}
    \Leftrightarrow y(5+x)=-4+2x
    \Leftrightarrow 5y+yx=-4+2x
    \Leftrightarrow 2x-yx=5y+4
    \Leftrightarrow x(2-y)=5y+4
    \Leftrightarrow x=...
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Isolating
    Posted in the Algebra Forum
    Replies: 7
    Last Post: August 28th 2011, 12:44 PM
  2. Isolating a value
    Posted in the Algebra Forum
    Replies: 10
    Last Post: January 18th 2011, 04:53 AM
  3. Isolating sin in an equation
    Posted in the Trigonometry Forum
    Replies: 4
    Last Post: April 10th 2010, 04:35 AM
  4. Isolating X....
    Posted in the Algebra Forum
    Replies: 1
    Last Post: May 19th 2009, 10:16 PM
  5. Isolating for x
    Posted in the Calculus Forum
    Replies: 2
    Last Post: March 21st 2008, 10:40 AM

Search Tags


/mathhelpforum @mathhelpforum