
Concept explainers
To solve: the system for the traffic flow represented by xi .

Answer to Problem 18CT
The system for the traffic flow has the solutions:
x1=700−s−t,x2=300−s−tx3=s,x4=100−t,x5=t
Explanation of Solution
Given information:
The flow of traffic through a network of streets is shown at the right.
Where i=1,2,3,4, and 5
Given figure
Calculation:
For the given figure in the question, the conservation of flow leads to a system of linear equations:
For the top left intersection:
Traffic in =x2+400
Traffic out =x1
Thus,
x1=x2+400x1−x2=400
For the top right intersection:
Traffic in =x1+x3
Traffic out =x4+600
Thus,
x1+x3=x4+600x1+x3−x4=600
For the bottom left intersection:
Traffic in =300
Traffic out =x2+x3+x5
Thus,
300=x2+x3+x5x2+x3+x5=300
For the bottom right intersection:
Traffic in =x4+x5
Traffic out =100
Thus,
x4+x5=100
Thus, we have a system of equations:
x1−x2=400...........(1)x1+x3−x4=600.......(2)x2+x3+x5=300.......(3)x4+x5=100..........(4)
The above system has 4 equations and 5 unknowns.
Therefore, the system has infinite number of solutions.
Suppose, x5=t ; therefore, (4) implies:
x4+t=100x4=100−t
Suppose, x3=s ; therefore (3) implies:
x2+s+t=300x2=300−s−t
And (1) implies:
x1−(300−s−t)=400[As x2=300−s−t]x1=700−s−t
Thus, the system for the traffic flow has the solutions:
x1=700−s−t,x2=300−s−tx3=s,x4=100−t,x5=t
Chapter 7 Solutions
Precalculus with Limits: A Graphing Approach
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