The solution is (see part (a)):

- x = 100 - z + w

y = 75 - z + w

z, w arbitrary (and non-negative),

where

- x = the hourly traffic down Rush St..

y = the hourly traffic down Pledge Ave.

z = the hourly traffic down Fasttrack Ave.

w = the hourly traffic down Depledge Blvd.

We are given z = 0, so the first equation in the solution becomes x = 100 + w, so x 100. In other words, there are at least 100 vehices per hour along Rush St.

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