(a) Formulate node-voltage equations for the circuit in Figure P3=7.

(b) Use MATLAB to find symbolic expressions for the node voltages in terms of the parameters in the circuit.
(c) Find numeric values for \(v_{\mathrm{A}}, v_{\mathrm{B}}\), and \(v_{\mathrm{C}}\) when \(R_{1}=10\) \(\mathrm{k} \Omega, R_{2}=15 \mathrm{k} \Omega, R_{3}=22 \mathrm{k} \Omega, R_{4}=33 \mathrm{k} \Omega, i_{\mathrm{S} 1}=10 \mathrm{~mA}\), and \(i_{\mathrm{S} 2}=30 \mathrm{~mA}\).
(d) Use Multisim to verify your solution to part (c) is correct.

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