construct a nonzero 22 matrix a such that the solution set of the equation is the line in through (,1) and the origin. then, find a vector b in such that the solution set of is not a line in parallel to the solution set of . why does this not contradict the theorem that states that if the equation is consistent for some given b and p is a solution, then the solution set of is the set of all vectors of the form , where is any solution of the homogeneous equation ?