1. The problem statement, all variables and given/known data For: f(x,y)=(x+y)/(x^2+2y^2+6) Find the stationary points of f 2. Relevant equations 3. The attempt at a solution To find a stationary point the first partial derivative must equal zero, correct? I've found the first partial derivatives using the quotient rule but my problem is, I can't rearrange them for y= or x= so I can substitute them into one equation and solve for x or y. What do I do now?