Question: The augmented matrix is in row-echelon form and represents a linear system. Solve the system by using backward substitution, if possible. Write the solution as

The augmented matrix is in row-echelon form and represents a linear system. Solve the system by using backward substitution, if possible. Write the solution as either an ordered pair or an ordered triple.0 0 -1 1 0 2 8 2 0 -4 0

0 0 -1 1 0 2 8 2 0 -4 0

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