1. The problem statement, all variables and given/known data The problem states: Use substitution to solve: y'=1/(x+y)^2-1 2. Relevant equations 3. The attempt at a solution I used the substitution of v=x+y resulting in the answer y=[3(x-C)]^(1/3) - x but I'm not too sure that's right Can some help with the answer and the steps for getting it. It's just for a practice test so I'm not graded on it.