Answered: b4 aj bị X4 X2 b3 X3 b2 az

Algebra: Structure And Method, Book 1

(REV)00th Edition

ISBN:9780395977224

Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole

Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole

Chapter1: Introduction To Algebra

Section1.3: Equations

Problem 9MRE

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Question

Consider the traffic flow diagram that follows,
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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