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Math Help - Matrice word problem

  1. #1
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    Matrice word problem

    The diagram below is a map of a system of one-way streets. Sensors have been
    installed at four points to monitor the volume of trac entering and leaving this
    system. The numbers given are the number of vehicles per hour recorded at those
    points. The variables x1, x2, x3 and x4 represent the number of vehicles per hour
    travelling along the remaining streets.

    Write down a system of linear equations linking x1, x2, x3 and x4.
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  2. #2
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    Quote Originally Posted by SyNtHeSiS View Post
    The diagram below is a map of a system of one-way streets. Sensors have been
    installed at four points to monitor the volume of traffic entering and leaving this
    system. The numbers given are the number of vehicles per hour recorded at those
    points. The variables x1, x2, x3 and x4 represent the number of vehicles per hour
    travelling along the remaining streets.

    Write down a system of linear equations linking x1, x2, x3 and x4.
    I don't see the "diagram below", but the strategy here is to write down, for each street intersection, an equation saying that the volume of traffic per hour entering that intersection is the same as the volume of traffic per hour leaving it.
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