1. The problem statement, all variables and given/known data The problem is rather simple. A set of linear equations, in the form V=Z*I, is given to represent a circuit in the frequency domain. The values for the V and I vectors are given and i have the Z(impedance) matrix writen in function of the Z1, Z2, Z3,...,Zn variables? In a simpler way: How to solve the A*x=B equation, when the values for the x and B vectors are given, and A is writen in function of A1, A2, A3,...,An variables. In my case, the A matrix looks like this: |A1 -A2 0 | |A1 0 -A3| |1 1 1 | x vector: -0.26 0.259 - i0.966 0.259 + i0.966 B vector: 150 + i0.342 -150 + i0.342 0 2. Relevant equations As simple as stated before, the only equation is the A*x=B. My example with all the complex numbers is not the best to ask for help in this subject, but it's the one that has led me to it. 3. The attempt at a solution So far i have tried algebraic manipulation of the A*x=B equation multiplying it by A^-1 in the attempt to somehow reduce the matrix into a vector or any of the vectors into a matrix. I tought maybe eigenvectors and eigenvalues could be involved in the solution of this problem, but since i don't have any linear algebra books around and don't really remember how to use this stuff, i'm hoping you guys could help me with this one.