- Let x = the hourly traffic down Rush St..,

let y = the hourly traffic down Pledge Ave.,

let z = the hourly traffic down Fasttrack Ave.,

let w = the hourly traffic down Depledge Blvd.,

If we set traffic in = traffic out at each intersection, we get the following system of equations

- x + z - w = 100

x-y = 25

y + z - w = 75

and the general solution is:

- x = 100 - z + w

y = 75 - z + w

z, w arbitrary (and non-negative).

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