I got a bit stuck on the second part of a question below, I'll show my first part working out as it's needed for the second part...

Q: The variables x and y are related by the differential equation

i) Use the substitution y=xz, where z is a function of x, to obtain the differential equation

For this I got:

So then part two says:

ii) Find by integration the general solution of the differential equation A.

I got this far on this question, and then got a bit stuck:

I don't really know where to go from here... So any help would be appreciated! Thanks!