Question: Consider the following traffic flow diagram, where a1, a2, a3, a4, b1, b2, b3, b4 are fixed positive integers. Set up a linear system in

Consider the following traffic flow diagram, where a1, a2, a3, a4, b1, b2, b3, b4 are fixed positive integers. Set up a linear system in the unknowns x1, x2, x3, x4 and show that the system will be consistent if and only if
a1 + a2 + a3 + a4 = b1 + b2 + b3 + b4
What can you conclude about the number of automobiles entering and leaving the traffic network?

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