Chapter 3, Problem 3.7P

The following are a set of node-voltage equations; draw the circuit they represent.

   $\begin{array}{l}{v}_{\text{A}}=v_{\text{S}}\\ \frac{v_{\text{B}}-v_{\text{A}}}{R_1}+\frac{v_{\text{B}}-v_{\text{C}}}{R_2}-i_{\text{S}}=0\\ \frac{v_{\text{C}}-v_{\text{A}}}{R_3}+\frac{v_{\text{C}}-v_{\text{B}}}{R_2}+\frac{v_{\text{C}}}{R_4}=0\\ v_{\text{D}}=0\end{array}$