1. The problem statement, all variables and given/known data Design an op-amp based circuit to produce the function Vout = 5*V1 - 4*V2 2. Relevant equations 3. The attempt at a solution I have no idea how to approach this. I know there are two voltages on the two inputs, and that the feedback resistors should be going to the negative input, but how do I pick the values for the resistors?