Math 151 Sections 5.1, 5.2, 5.5 You must show all work NEATLY in the space provided. Indicate your final answer. Upload your work as a PDF file. Solve the system by elimination. 1) -7x - 6y = -13 -3x + 3y =-39 Use the Gauss-Jordan method to solve the system of equations. If the system has infinitely many solutions, give the solution with y arbitrary. 2) 6x + 4y = -4 5x + 7y = 4 Solve the problem using matrices. If using technology to solve, show the setup and solution matrices. 3) Jerry has three pieces of string. The total length is 107 cm. The sum of the two longer pieces is 89 cm. The middle piece is twice as long as the shortest piece. What are the lengths of the three pieces? Give all solutions of the nonlinear system of equations, including those with nonreal complex components. 4) x2 + y2 =1 x+ y =-1