could you help me with this question?

Please type rather then write!

[10 pts] In solving this problem, you may nd it helpful to remember the rules of thumb for adding and multiplying odd and even numbers (e.g., an odd plus an odd is even). Let 9:, y, 2 be three integers. Consider the following implication. If 3:2 = y2 -| 22, then xyz is even. Write down the contrapositive of this implication, and then prove it