Question: In Exercises 3-4, suppose that the augmented matrix for a lin- ear system has been reduced by row operations to the given row echelon form.

In Exercises 3-4, suppose that the augmented matrix for a lin- ear system has been reduced by row operations to the given row echelon form. Solve the system. 4 -J 3. (a) 0 0 UN 8 5 (b) | 0 4 -9 NW O 0

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