1. The problem statement, all variables and given/known data [tex]-y + xy' = 0 [/tex] and y(2)=5 3. The attempt at a solution This first part trips me up. I am supposed to find the perfect derivative, which is [tex](xy') = 0 [/tex] ? Is this legal, or does the -y not allow for that? If that is correct, then I know that I integrate that, which gives me [tex] xy = c [/tex] Then, to solve for c, I just plug in 2 and 5.