1. The problem statement, all variables and given/known data Find the complete solution to Ax = b for b = (-1,0,1). 2. Relevant equations Reduced-row echelon form procedure. Matrix multiplication procedure. 3. The attempt at a solution I have no idea what is being done in the solution attached (other than the reduced-row echelon and matrix multiplication procedures). If someone could help me understand what the attached solution is saying, I would very much appreciate it!