A matrix is given in row-echelon form. 1 0 -2 2 2 0 1 3 0 -11 0 0 1 -1 0 0 0 0 1 -4 (a) Write the system of equations for which the given matrix is the augmented matrix. (Enter each answer in terms of x, y, z, and w.) = 2 = -11 = 0 = -4 (b) Use back-substitution to solve the system. (x, y, z, w) = 1

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