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Use elementary row operations to transform the augmented coefficient matrix to echelon form. Then solve the system by back substitution. X1 - 3X, + 4X3

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Use elementary row operations to transform the augmented coefficient matrix to echelon form. Then solve the system by back substitution. X1 - 3X, + 4X3 = 31 2x1 + X2 + X3 = 13 -3x1 + 3x2 -2X3 = -31 . . . An echelon form for the augmented coefficient matrix is

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