Question: In Problems 1122, use elementary row operations to transform each augmented coefficient matrix to echelon form. Then solve the system by back substitution. 2x 1

In Problems 11–22, use elementary row operations to transform each augmented coefficient matrix to echelon form. Then solve the system by back substitution.

2x₁ + 5x₂ + 12x₃ = 6

3x₁ + x₂ + 5x₃ = 12

5x₁ + 8x₂ + 21x₃ = 17

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