1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Three Equations, Three Unknowns.

  1. Mar 7, 2010 #1
    1. The problem statement, all variables and given/known data

    But somehow not that simple..

    [tex]\frac{5xy}{x+y}[/tex] [tex]=6\left.[/tex]

    [tex]\frac{7yz}{y+z}[/tex] [tex]=10\left.[/tex]

    [tex]\frac{8zx}{z+x}[/tex] [tex]=15\left.[/tex]

    2. Relevant equations



    3. The attempt at a solution

    Tried and failed.
     
  2. jcsd
  3. Mar 7, 2010 #2

    epenguin

    User Avatar
    Homework Helper
    Gold Member

    Looks like if you turned the equations upside down you have something easy to solve.

    I think they want you to see that, although you could no doubt slog it out by cross multiplying and eliminating.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook