Results 1 to 7 of 7

Math Help - Math modeling question ???

  1. #1
    Newbie
    Joined
    Mar 2008
    Posts
    22

    Question Math modeling question ???

    How can I write an expression for the sum of two(unknown) numbers in terms of just x ?

    Can I write:

    x=1/y

    or ....

    x=1/X ?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by kbgemini16 View Post
    How can I write an expression for the sum of two(unknown) numbers in terms of just x ?

    Can I write:

    x=1/y

    or ....

    x=1/X ?
    More detail please, this question makes no sense (to me at least) as it stands.

    RonL
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Mar 2008
    Posts
    22

    No Clue...

    The directions are to create an expression that represents two unknown numbers for which I will use "x" & "y" to represent them. How can I write an expression for their sum in terms of just X

    So since it's asking for an expression for the sum of the two unknown numbers I know the expressions that I need to create will have a "+" but I can't show the expression in terms of just "x"

    I was thinking that:
    f(x)=x+y

    or...

    f(x)=1/y

    or...

    f(x)=1/x

    I don'rt know, I'm lost because I don't understand the part of the question that asks for the sum in terms of just "x" ....






    Quote Originally Posted by CaptainBlack View Post
    More detail please, this question makes no sense (to me at least) as it stands.

    RonL
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by kbgemini16 View Post
    The directions are to create an expression that represents two unknown numbers for which I will use "x" & "y" to represent them. How can I write an expression for their sum in terms of just X
    There is something wrong here are X and x the same thing?
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Mar 2008
    Posts
    22
    Yes "X" & "x" are the samething my error ...
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by kbgemini16 View Post
    Yes "X" & "x" are the samething my error ...
    Then I think what you ask is impossible. It is possible to create a number that
    encodes two numbers (think of interleaving the digits of a decimal expansion)

    RonL
    Follow Math Help Forum on Facebook and Google+

  7. #7
    Member
    Joined
    Mar 2008
    Posts
    148
    Is it known how x and y are related? In other words can you express one of the unknowns in terms of the other (for example maybe y=x^2)? Then expressing the sum of the two unknowns in terms of just one unknown is a triviality.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. help with math modeling: trig horizontal shift
    Posted in the Trigonometry Forum
    Replies: 0
    Last Post: April 19th 2010, 06:52 PM
  2. Math Modeling
    Posted in the Advanced Math Topics Forum
    Replies: 1
    Last Post: December 22nd 2009, 04:10 PM
  3. modeling first order equation..(Long question, fairly easy tho)
    Posted in the Differential Equations Forum
    Replies: 2
    Last Post: February 4th 2009, 12:28 PM
  4. Cr. Math and a dumb math question
    Posted in the Algebra Forum
    Replies: 4
    Last Post: October 4th 2007, 02:55 PM
  5. Topics for a math modeling project?
    Posted in the Advanced Math Topics Forum
    Replies: 4
    Last Post: March 23rd 2007, 07:53 AM

Search Tags


/mathhelpforum @mathhelpforum