Hi could you kindly explain what the answer is for this? Also fyi this is a past paper

Problem 3. (6 points) Consider the following grid of 9 one-way streets and 5 intersections. The labels on the streets denote the traffic flow in cars per hour (observed or undetermined). The total number of cars remains constant throughout. 100 X2 Xu 150 / 175 1* 3 200 Math 221, Midterm Exam I Page 2 of 3 (a) Write down the augmented coefficient matrix of the linear system of equations which determines the traffic flow along the streets marked X1, . .., 25. Please write the equations in alphabetical order. Do not solve. (b) The reduced row echelon form of this coefficient matrix is 0 0 0 1 150 010 0 1 300 0 010 -1 150 0 0 01 1 50 0 0 0 0 0 Write down the general solution in parametric form, using 25 as parameter. (c) What is the maximal amount of traffic along the street marked 4