Question: Solve each system in Exercises 1-2 by using elementary row operations on the equations or on the augmented matrix. Follow the systematic elimination procedure described

Solve each system in Exercises 1-2 by using elementary row operations on the equations or on the augmented matrix. Follow the systematic elimination procedure described in this section.
1. x1 + 5x2 = 7
-2x1 - 7x2 = -5
2. 3x1 + 6x2 = -3
5x1 + 7x2 = 10

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