Question: Let a, b, c, d e Q, and let a E R Q. Prove the following: a) If ad bc # 0, then ca

Let a, b, c, d e Q, and let a E R

Let a, b, c, d e Q, and let a E R Q. Prove the following: a) If ad bc # 0, then ca + d + 0, and the number ax + b cx + d is irrational. b) If ad bc = 0, then either ca + d = 0, or ax + 6 cx + d is rational.

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