Question: use elementary row operations to trans- form each augmented coefficient matrix to echelon form. Then solve the system by back substitution. 1 3x1 +

use elementary row operations to trans- form each augmented coefficient matrix to echelon form. Then solve the system by back substitution. 1 3x1 + x2 3x3 = -4 x + x + x3 = 1 5x1 + 6x2 + 8x3 = = 8

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