# Homework Help: Three Equations, Three Unknowns.

1. Mar 7, 2010

### ƒ(x) → ∞

1. The problem statement, all variables and given/known data

But somehow not that simple..

$$\frac{5xy}{x+y}$$ $$=6\left.$$

$$\frac{7yz}{y+z}$$ $$=10\left.$$

$$\frac{8zx}{z+x}$$ $$=15\left.$$

2. Relevant equations

3. The attempt at a solution

Tried and failed.

2. Mar 7, 2010

### epenguin

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.