1. The problem statement, all variables and given/known data The figure attached shows a network of one way streets. On a particular day the traffic flow was measured at each of the intersections a b c and d. The numbers in the figure represent the average number of vehicles per minute through the four intersections. A) Set up and solve a system of linear equations to find x1,x2,x3, and x4 B) Street AD is temporarily closed due to an accident. What will be the average traffic flow on the other streets? 2. Relevant equations 3. The attempt at a solution I reached the equations; 50=x1+x2 40=x2+x4 40=x3+x4 50=x1+x3 Which gave me x1=0, x2=50, x3=50,x4=-10 However... I think I did this incorrectly.