1. The problem statement, all variables and given/known data dy/dx = x/(x2y + y3) 2. Relevant equations 3. The attempt at a solution The middle term is what's throwing me off. I can't put it in terms of y = vx (Dividing by x2 means that the y term gets screwed up. (It would turn it into yv2). Out of curiosity, I tried flat-out substituting y = vx (and turning dy/dx into x*dv/dx + v), but that didn't work either. It's obviously not exact, and I don't see how it could be made linear, so I'm not sure where to begin.