Results 1 to 8 of 8

Math Help - how do i solve this for x y = x/(x+z)

  1. #1
    Newbie
    Joined
    Jun 2012
    From
    uk
    Posts
    7

    how do i solve this for x y = x/(x+z)

    how do i solve this for x

    y = x/(x+z)

    really bugging me. Is it possible. If you need more information on it i can explain what I'm trying to work out.

    If i have an amount which i will call z and i want to add another amount to it which i will call x but i want the amount x to be a certain percentage of x + z. The certain percentage is y represented as a number less than 1.

    .25 = 5/(5+15)

    25%

    i want to be able to take the percentage and the original amount and find out what x need to be to match the original amount to the percentage y.

    Any help would be much appreciated.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,969
    Thanks
    1789
    Awards
    1

    Re: how do i solve this for x y = x/(x+z)

    Quote Originally Posted by lukebond View Post
    how do i solve this for x
    y = x/(x+z)
    Can you solve (x+z)y=x for x~?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Jun 2012
    From
    uk
    Posts
    7

    Re: how do i solve this for x y = x/(x+z)

    To be honest. No. But i would love an explanation or a point in the right direction.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Jun 2012
    From
    uk
    Posts
    7

    Re: how do i solve this for x y = x/(x+z)

    I can expand the brackets but i can't seem to merge the x together.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    MHF Contributor

    Joined
    Apr 2005
    Posts
    16,458
    Thanks
    1868

    Re: how do i solve this for x y = x/(x+z)

    y = x/(x+z)

    1. Multiply on both sides to get y(x+ z)= x.

    2. Expand the bracket to get yx+ yz= x.

    3. Subtract both yz and x from both sides to get yx- x= -yz

    4. Factor x out on the left to get (y- 1)x= -yz.

    5. Divide both sides by y- 1.
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Newbie
    Joined
    Jun 2012
    From
    uk
    Posts
    7

    Re: how do i solve this for x y = x/(x+z)

    Is there anywhere i can find out more about the factor out step or can you just give me a quick explanation. And thanx alot this is exactly what i wanted.
    Follow Math Help Forum on Facebook and Google+

  7. #7
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,969
    Thanks
    1789
    Awards
    1

    Re: how do i solve this for x y = x/(x+z)

    Quote Originally Posted by lukebond View Post
    Is there anywhere i can find out more about the factor out step or can you just give me a quick explanation. And thanx alot this is exactly what i wanted.
    Yes there is a way. Learn basic graded school algebra.
    But know that this is not a tutorial service.
    Follow Math Help Forum on Facebook and Google+

  8. #8
    Newbie
    Joined
    Jun 2012
    From
    uk
    Posts
    7

    Re: how do i solve this for x y = x/(x+z)

    Its ok I get it now.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. need to solve summation equation to solve sum(x2)
    Posted in the Statistics Forum
    Replies: 2
    Last Post: July 16th 2010, 11:29 PM
  2. How Do I solve This?
    Posted in the Discrete Math Forum
    Replies: 1
    Last Post: March 30th 2010, 02:52 PM
  3. Replies: 1
    Last Post: June 9th 2009, 11:37 PM
  4. solve for x
    Posted in the Trigonometry Forum
    Replies: 5
    Last Post: August 16th 2008, 03:30 PM
  5. can you solve these?
    Posted in the Pre-Calculus Forum
    Replies: 0
    Last Post: August 14th 2008, 02:27 PM

Search Tags


/mathhelpforum @mathhelpforum