Chapter 1.3, Problem 22E

Network Analysis The figure shows the flow of traffic (in vehicles per hour) through a network of streets.

(a) Solve this system for $x_i,i=1,2,\mathrm{...},5.$

(b) Find the traffic flow when $x_2=200$ and $x_3=50.$

(c) Find the traffic flow when $x_2=150$ and $x_3=0$.