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 - 6x₂ + x₃ + 13x₄ = 15

3x₁ - 6x₂ + 3x₃ + 21x₄ = 21

2x₁ - 4x₂ + 5x₃ + 26x₄ = 23

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