1. The problem statement, all variables and given/known data Find the Y-parameters for the following two-port circuit 2. Relevant equations 3. The attempt at a solution Node 1 :V1(1/3+1/4)-1/4V2=I1 Node 2 : -1/4V1 + V2(1/4+1/5)-1/5(2I1)=I2 Subtitute I1 from the first equation to second equation, we have : I1=7/12V1-1/4V2 I2=-29/60V1+11/20V2 So y11=7/12, y12=-1/4, y21=-29/60, y22=11/20 But the solution gives me that y12=1/4 and y21=29/60, there are differences of signs. I haven't found my mistake.