1. The problem statement, all variables and given/known data R1 = 1K Ohm R2= 50K Ohm gM = 100mA/V I should find the equivelent resistor seen from the two terminals on the left 2. Relevant equations Nodes equations, Ohm's law. 3. The attempt at a solution So, I started by putting a test voltage source on the left but I end up with 2 variables on the equivalent resistor equation that I can't be able to solve. I did Circuit analysis last year, which I passed but now I'm a bit rusty with this. Anyone can help me?