7-7. A two-loop circuit is configured as shown in Fig. P7.7 with V = 200 V, V = 100 V, R =R =R = 75 92. The volt- ages V and V satisfy the following sys- tem of equations: (V-V2)=Rl+ (R + R)I 0 = RI + (R+ R3)I+V 12 www Ry www R Figure P7.7 Two-loop circuit for problem P7-7. Chapter 7 Systems of Equations in Engin (a) Substitute the given values and write the system of equations in the matrix form Ax = b, where x= (b) Find and using the matrix algebra method. Perform all matrix computations by hand and show all steps. (c) Find I, and I using Cramer's rule. (d) Based on your answers from parts (b) and (c), were the currents and I drawn in the correct orientation? How do you know?