Here is the circuit you are going to use.  To use the simulator, follow the steps below.

• Get all coefficients in the equation (by clicking every element).  You need to fill in all of the places in the conductance matrix, and source vector, as appropriate, and you need to get all of the information into the conductance matrix and source vector - for every element.
• Normalize the second row in the conductance matrix by making the first coefficient the negative of the same coefficient one row above.  You are using a standard method for solution of these simultaneous equations.
• Add the two rows and replace the second row by the sum of the two rows.
• Solve the second equation for V_y.
• Back-substitute the second equation into the first.

Solve the first equation for V_x.