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 - 4x₂ - 3x₃ - 3x₄ = 4

2x₁ - 6x₂ -5x₃ - 5x₄ = 5

3x₁ - x₂ - 4x₃ - 5x₄ = -7

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