1. The problem statement, all variables and given/known data 2. Relevant equations V = IR I1 + I2 .... + In = 0 for a node (KCL) V1 + V2 .... + Vn = 0 for a loop (KVL) 3. The attempt at a solution I've really been struggling with this problem and Thevenin/Norton problems in general. I just can't seem to perform the proper circuit analysis. I know that I can set IA = 0 and VAB = VVoc in order to find Thevenin values, but I just keep getting stuck. I tried to do KCL on the top node, which got me -kvx - (vx/50Ω) + ((vs - vx)/200Ω), but that appears to be getting me nowhere. I've been trying to find a relation between vx and vAB so I can substitute in, but to no avail. I'd really appreciate a nudge in the right direction here as well as general advice, as I'm pretty lost.