First order differential equation

Hi,

I'm new to this forum, so please let me know if I'm posting in the wrong place and I'll move this thread.

I have the equation:

(x-y)dx + (x+y)dy = 0

So far I've rearranged it to get:

y' = (-x+y) / (x+y)

But I'm not sure where to go from here.

Help would be appreciated,

Thanks

Re: First order differential equation

Re: First order differential equation

Quote:

Originally Posted by

**chisigma** Setting

You arrive at

the DE...

(2)

After you set t=y/x, I don't understand how you get to the next part,

Thanks

EDIT: Understand now, thanks

Re: First order differential equation

Quote:

Originally Posted by

**dwally89** After you set t=y/x, I don't understand how you get to the next part,

Thanks

EDIT: Understand now, thanks

. This is a product of functions, so to get you need to use the product rule on .