he figure shows the flow of traffic (in vehicles per hour) through a network of streets. 400 300- x1 X4 X2 X3 600 100 x5 (a) Solve this system for xi, i = 1, 2, 5. (If the system has an infinite number of solutions, express X1, X2, X3, X4, and x5 in terms of the parameters s an (X1, X2, X3, X4, X5) (b) Find the traffic flow when x3 = 0 and x5 = 70. (X1, X2, X3, X4, X5) = (c) Find the traffic flow when X3 X5 = 100. (X1, X2, X, X4, X