Please Answer Question 4 and Question 5

4. (5 points) Consider the following network of roads found in Seattle, which are shown below. The flow rates are given in vehicles per day, and are derived from an official study by the Seattle Transportation Traffic Management Division. All of the roads in the diagram are one-way in the direction indicated except for Third Avenue, which runs both northbound and southbound. Variables are assigned to the traffic flows as given in the diagram. For example, since Fifth Street is a one-way street, x1 represents the volume of traffic flowing along Fifth Street from Pike Street to Union Street. On Third Street the variables x15, x16, and x17 represent the net traffic flow southbound along Third Street, which is the volume of traffic southbound minus the volume northbound. Construct a system of linear equations which would model this situation. You don't need to solve the system. 5. (8 points) The following network of roads existed in Washington DC prior to 1995 . The flow rates are given in thomonda of rohisloc nor dor and aro dariend from on nffiniol 1002 District of Columbia survey. Similar to Third Street in Problem 4, 17th Street, 15th Street, H Street, and E Street are all two way roads. (a) Using the idea from Problem 4, assign variables for the net traffic flow on each section of the roads. (b) Construct a linear system to model this situation. You don't need to solve the system