A = [(a, 0, 1), (1, c, b), (1, d, b)], B = [(a, 1, 1), (0, d, c), f, g, h)], U = [f, g, h], V = [a2, 0, 0]. If there is a vector matrix X, such that AX = U has infinitely many solutions, then prove that BX = V cannot have a unique solution. If afd ≠ 0 then prove that BX = V has no solution.