# Silly question about exact equations.

1. Jun 28, 2013

### Paintjunkie

Can you manipulate any exact equation to be a first order linear equation? if you are not concerned with which variable is the dependant one and which is the independant one. i.e. dx/dy or dy/dx?

2. Jun 28, 2013

### Simon Bridge

3. Jun 28, 2013

### HallsofIvy

Certainly not. For example $cos(x)dy- sin(x)dx= 0$ is an exact equation but we cannot get rid of those trig functions.