Question: 1. Prove by cases that if x is an integer, then x + 5x - 1 is odd. 2. Prove by cases that for

1. Prove by cases that if x is an integer, then x

1. Prove by cases that if x is an integer, then x + 5x - 1 is odd. 2. Prove by cases that for every integer n, n >n. 3. Prove that if x and y are integers such that x (y + 5) is odd, then x is odd and Y is even. For this one, use the contrapositive first, and then prove that by cases.

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