4.If the circuit contains voltage sources, temporaril modify the given circuit by replacing each such source by a short circuit, thus reducing the number of nodes by one for each voltage source that is present. The assigned node voltages should not be changed Using these assigned node-to-reference voltage, apply Kirchhoff s current law at each of the nodes or super- nodes in this modified circuit. Relate each source voltage to the variables vi, v2,..., VN-I, if it is not already in that form4.If the circuit contains voltage sources, temporarily modify the given circuit by replacing each such source by a short circuit, thus reducing the number of nodes by one for each voltage source that is present. The assigned node voltages should not be changed. Using these assigned node-to-reference voltage, apply Kirchhoff ' s current law at each of the nodes or super￾nodes in this modified circuit. Relate each source voltage to the variables v1 , v2 ,…,vN-1 , if it is not already in that form