Pentagon MNOPQ has vertices M(1, -5), N(5, 1), O(3, 2), P(4, 6), and Q(-2, 3). Pentagon M'N'O'P'Q' has vertices M'(5, -6), N'(7, -1), O'(5, 0), P'(6, 4), and Q'(0, 1). Which explanation best shows that the two figures are not congruent?