500

A

x3

X2

C

X1

X4

1x5/

100

1x6

B

400

(a) Write equations that describe the traffic flow. At each intersection, set the flow

in equal to the flow out.

(b) Find the augmented matrix corresponding to the system of linear equations in

part (a).

(c) [C] (You may use a calculator or computer algebra system to do the elimination

process for this problem.) Give the reduced echelon form of your augmented

matrix.