A. An echelon form for the
augmented coefficient matrix is?
B. x1, x2, x3?
Use elementary row operations to transform the augmented coefficient matrix to echelon form. Then solve the system by back substitution. -X₁ + x₂ + x3 = -1 -X₁ +4x₂-11x3 = -16 5x₁4x29x3 = 0