In the following circuit, compute the values of R1 and R3 in terms of R2 and R4, such that vo is always equal to v1 - 5v2. I have marked 3 nodes, A, B and C. v+ = v- as assumption for the op-amp. Consider node A. v- = v+ = v1 × (R2 / (R1+R2)) Consider node B and C. (v- - v2) / R3 = (vo - v-) / R4 I now stick at here... I can write R1 in terms of R2, but there exist v- and v1. And for R3, the same problem exists. First, is there anything wrong in my above computations? Second, can I express R1 and R3 in terms of R2 and R4 without using other unknowns?