Three Variable Simultaneous Differential Equation

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SUMMARY

The discussion centers on solving the three-variable simultaneous differential equation represented as dx/(y+z)=dy/(x+z)=dz/(x+y). The user attempted a substitution method using u=x+y+z and du=dx+dy+dz but did not reach a solution. The provided answer format is sqrt(x+y+z) = a/(z-y) = b/(x-z), indicating a relationship among the variables. This highlights the complexity of multi-variable differential equations and the need for effective substitution techniques.

PREREQUISITES
  • Understanding of differential equations, specifically simultaneous equations.
  • Familiarity with substitution methods in calculus.
  • Knowledge of algebraic manipulation and solving for variables.
  • Basic concepts of multi-variable functions and their relationships.
NEXT STEPS
  • Research advanced techniques for solving simultaneous differential equations.
  • Explore the method of characteristics for partial differential equations.
  • Learn about substitution methods in differential equations, focusing on multi-variable cases.
  • Study the implications of implicit functions in solving complex equations.
USEFUL FOR

Mathematicians, engineering students, and anyone interested in advanced calculus or differential equations will benefit from this discussion.

ForMyThunder
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I have had a troubling time trying to solve this equation out of this book I have (not homework, just for fun). Here it is:

dx/(y+z)=dy/(x+z)=dz/(x+y)

I've tried the substitution u=x+y+z, du=dx+dy+dz but I couldn't arrive at an answer. Any suggestions?
 
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If it is any help, the answer is given as:

sqrt(x+y+z) = a/(z-y) = b/(x-z)

I think I've solved this equation before but I can't remember how.
 

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