1. The problem statement, all variables and given/known data The op am in the circuit shown is ideal. Calculate the following. a) Ia b) Va c) Vo d) Io 2. Relevant equations I have found three equations one at Vn, Va, and Vo. 3. The attempt at a solution The attempt solution is on the attachment. I currently have three equations with four unknowns. I think I need to find a constraint equation, but not sure where to obtain it from. The constraint equation I have on attachment for Io valid?