2. Write each of the system of equations below as a matrix equation of the form AX-B. Then solve each system using A-¹. Hint: You may use your result from problem #1. a. x+2y-3z=-7 2x+y=z=0 3x+2y+z=1 b. x+2y-3z=20 2x+y=z=15 3x+2y+z=10

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