The figure shows the flow of traffic (in vehicles per hour) through a network of streets. (Assume a = 200 and b = 400.) b X1 X3 b (a) Solve this system for x;, i = 1, 2, 3, 4. (If the system has an infinite number of solutions, express x1, x2, X3, and x4 in terms of the parameter t.) X4 (X1, X2, X3, X4) = ( ) (b) Find the traffic flow when x4 (X1, X2, X3, X4) = ( (c) Find the traffic flow when x4 200. (X1, X2, X3, X4) = ( (d) Find the traffic flow when x1 5Xs. (X1, X2, X3, X4) = ( X X4 X5 (a) Solve this system for x;, i =1, 2, ..., 5. (If the system has an infinite number of solutions, express x1, X2, X3, X4, and xs in terms of the parameters s and t.) (X1, X2, X3, X4, X5) = ( ) (b) Find the traffic flow when x3 = 0 and x5 = 70. (X1, X2, X3, X4, X5) = ( ) () Find the traffic flow when x3 = x5 = 90. (X1, X2, X3, X4, X5) = ( )