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

x₁ + x₂ + x₃ = 6

2x₁ - 2x₂ - 5x₃ = -13

3x₁ + x₃ + x₄ = 13

4x₁ - 2x₂ - 3x₃ + x₄ = 1

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