Question: The linear systems in Problems 110 are in echelon form. Solve each by back substitution. 2x 1 - 5x 2 + x 3 = 2

The linear systems in Problems 1–10 are in echelon form. Solve each by back substitution.

2x1 - 5x2 + x3 = 2

          3x2 - 2x3 = 9

                   x3 = -3

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