1. The problem statement, all variables and given/known data I have to prove that RI = RSRP/(RS - RP) by circuit analysis. 3. The attempt at a solution So I tried to create a system of equations to do this: For the first circuit using kirchoffs rules: V-IA(RS + RI) = 0  For the second circuit: V-IBRS - IPRP = 0  V-IBRS - (IA)/2 * RI = 0 (It's IA/2 because of kirchoff's rules regarding the junction therefore it's equivalent to the first circuit's I divided by 2)  IB = IP + IA/2  First I solved for V for first 3 equations. Then for equation 4, i solved for IA/2 to make it easier for me, then I substituted it and tried to eliminate as much variables as I can by equating  and . then whatever result I get for that, I then equate it to . After doing this, I get IB(2Rs + RI) = IP(2Rs + RI -RP) Solving this using my head, I know I wont be able to prove the Ri equation. Any tips or other methods to do this?