Find an explicit description of Nul A by listing vectors that span the null space.
Assume that A is row equivalent to B. Find bases for Nul A and Col A.
Suppose that the augmented matrix of a linear equations has been partially reduced using elementary row operations to
Find all the value(s) (if any) of r and s for which the given system has:
(a) a unique solution, (b) an infinitely many solutions, (c) No solutions.