Refer to picture, all streets are one way numbers show how many cars enter or leave the city via this section of streets in a one hour period.  The variables x,y,z,w represent the cars that travel along the portion of 1st, 2nd, avocado aircraft streets during this period.  Assume no cars stop or park. Set up appropriate system of linear equations needed to find x,y,z,w.  DONT SOLVE, JUST SET UP.  Hint, the total # of cars going in an intersection must equal the total # of cars coming out of that intersection)

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A: Explanation of the answer is as follows

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