Question: In Problems 1122, use elementary row operations to transform each augmented coefficient matrix to echelon form. Then solve the system by back substitution. 3x 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.

3x₁ + x₂ + x₃ + 6x₄ = 14

x₁ - 2x₂ + 5x₃ - 5x₄ = -7

4x₁ + x₂ + 2x₃ + 7x₄ = 17

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