Three Variable Simultaneous Differential Equation

In summary, a three variable simultaneous differential equation is a mathematical equation used to model real-world situations that involves three variables and their respective rates of change. It can be solved using techniques such as separation of variables, substitution, and linear combination, and has applications in physics, engineering, economics, and other fields. Challenges in solving these equations include finding the appropriate technique, accurately identifying initial and boundary conditions, and the complexity of the equations. Some tips for solving them include carefully identifying variables, choosing the right technique, and practicing with similar equations.
  • #1
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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  • #2
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.
 

FAQ: Three Variable Simultaneous Differential Equation

What is a three variable simultaneous differential equation?

A three variable simultaneous differential equation is a mathematical equation that involves three variables and their respective rates of change. It is used to model real-world situations and can be solved to determine the values of the variables at any given point in time.

How is a three variable simultaneous differential equation solved?

A three variable simultaneous differential equation is solved by using various techniques such as separation of variables, substitution, and linear combination. These techniques involve manipulating the equation to isolate each variable and then integrating to find the general solution.

What are the applications of three variable simultaneous differential equations?

Three variable simultaneous differential equations are widely used in physics, engineering, and economics to model complex systems and predict their behavior over time. They are also used in population dynamics, chemical reactions, and biological processes.

What are the challenges in solving three variable simultaneous differential equations?

One of the main challenges in solving three variable simultaneous differential equations is finding the appropriate technique to use. The equations can be complex and require advanced mathematical skills to manipulate and solve. Additionally, the initial conditions and boundary conditions must be accurately identified to obtain a meaningful solution.

What are some tips for solving three variable simultaneous differential equations?

Some tips for solving three variable simultaneous differential equations include carefully identifying the variables and their rates of change, choosing an appropriate technique based on the equation's form, and checking the solution by substituting it back into the original equation. It is also helpful to break down the equation into smaller, simpler parts and to practice solving similar equations to improve understanding and proficiency.

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