Solution:

$ \begin{aligned} \\ &\text { Equations of } z \text {-parameter are given by }\\\\ &V_1(s)=Z_{11} I_1(S)+Z_1 2 \cdot I_2(S)...(1)\\\\ &V_2(s)=Z_{21} I_1(s)+Z_{22} \cdot I_2(s)...(2)\\\\ &\Delta Z=\left|\begin{array}{ll} Z_{11} & Z_{12} \\\\ Z_{21} & Z_{22} \\ \end{array}\right|=Z_{11} \cdot Z_{22}-Z_{12} \cdot Z_{21}...(3)\\\\ &\Delta_1=\left|\begin{array}{ll} V_1(s) & Z_{12} \\\\ V_2(s) & Z_{22} \\ \end{array}\right|=Z_{22} …