# Three Equations, Three Unknowns.

## Homework Statement

But somehow not that simple..

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

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

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

## The Attempt at a Solution

Tried and failed.

## Answers and Replies

Related Precalculus Mathematics Homework Help News on Phys.org
epenguin
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.