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SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Find the solution using Gaussian elimination. Show all the steps. If you have infinitely many solution, write solution using parameter - the way we did in the class. (20 points) 1) 3x2 X4 = -6 1) x1 + x2 + 5x3 - x4 = 33 3x1 + x3 + 5X4 = 8 X1 + x2 + 5x3 = 30 Solve the problem. 2) The network in the figure shows the traffic flow (in vehicles per hour) 2 ) over several one-way streets in the downtown area of a certain city during a typical lunch time. Determine the general flow pattern for the network. In other words, find the general solution of the system of equations that describes the flow. It may be possible that you end up with infinitely many solutions. In that case express the answer using parameter. What is the maximum possible value of x4? (20 points) 200 700 400 X 1