$11-16.$ sidered as a two$-$port circuit may be and in another resistive circuit. The eme derest short$-$circuit admittances: $y_{11}=y_{22}={22}^3{y}_{21}=20,$ and $y_{12}=1d.$ If $I_a$ is a curre the voltages equal to $1$ amp $,$ find the voltages $V_1$ and $V_{\text{I}}$

of the two ports of the circuit $N.$

Fig. P$11-16.$