If solving a system of linear equations by elimination or substitution I get that 0=0, as final or intermediate step depending on the system, it means (check all that apply) I have definitely made a mistake and need to review the result

If the system of equations is 2 linear equations in 2 variables, there is infinity number
of solution

If the system of equations is 3 linear equations in 3 variables, there might be infinite
number of solutions

If the system of equations is n linear equations in n variables, there is one unique solution