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 - 4x₂ + 5x₂ = 15 2x₁ + x₂ + x3 = 3 -2x₁ + 3x₂-