Thread: Substitution problem

Hi, I have to solve



using the substitution u=y+x. It isn't necessary to explicitly for y in terms of x.

How do I go about doing this? Do I need to use partials when converting to ?

Cheers,
Ben

Do I need to use partials...

Nope. Just set u = y + x. Then u' = y' + 1. It follows that u' - 1 = y'. Substitute into your DE, and off you go.