1. The problem statement, all variables and given/known data 2. Relevant equations KVL: ΣV = 0 KCL: ΣI = 0 v = iR 3. The attempt at a solution I started by removing the independent current source to leave an open circuit. Then I attempted nodal analysis at nodes v1, v2, and v3: KCL @ v1: (v1 - v2)/10 = v1/40 KCL @ v2: (v2 - v1)/10 - 4io + (v2 - (-30))/20 = 0 KCL @ v3: v3 = -30 V io = (v1 - v2)/10 Plugging equation 4 into euation 2 and simplifying gives... .1v2 - .1v1 -.4v1 + .4v2 + (v2 - (-30))/20 = 0 .55v2 - .5v1 + 1.5 = 0 Simplifying equation 1: .1v1 - .1v2 = .025v1 v2 = .75v1 Plugging this in... .55(.75v1) - .5v1 + 1.5 = 0 ... v1 = 17.1V v2 = 12.9V This makes io = .42A which is wrong. Where did I mess up?