# Non linear equation

## Homework Statement

Solve x,y and z from $$\frac{y+z}{a}= \frac{x+z}{b}=\frac{x+y}{c} = xyz$$

wit a,b,c not equal to zero.

## The Attempt at a Solution

I have no idea how to start. I've tried several things but it seems like I'm missing something. I did find the trivial solution (0,0,0).

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Ray Vickson
Homework Helper
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## Homework Statement

Solve x,y and z from $$\frac{y+z}{a}= \frac{x+z}{b}=\frac{x+y}{c} = xyz$$

wit a,b,c not equal to zero.

## The Attempt at a Solution

I have no idea how to start. I've tried several things but it seems like I'm missing something. I did find the trivial solution (0,0,0).
You say you tried several things. What were they? You need to show your work.

## Homework Statement

Solve x,y and z from $$\frac{y+z}{a}= \frac{x+z}{b}=\frac{x+y}{c} = xyz$$

wit a,b,c not equal to zero.

## The Attempt at a Solution

I have no idea how to start. I've tried several things but it seems like I'm missing something. I did find the trivial solution (0,0,0).
Rewrite the equation as
$$\frac{1}{a}\left(\frac{1}{xz}+\frac{1}{xy}\right)=\frac{1}{b} \left( \frac{1}{yz}+\frac{1}{xy}\right)=\frac{1}{c}\left(\frac{1}{yz}+\frac{1}{xz}\right)=1$$
Substitute ##1/(xy)=p, 1/(yz)=q## and ##1/(xz)=r##. Form three equations to find p, q and r. This gives the possible non-zero solutions.

Understood, thanks.