Translate the following inference to logic notation: For all x, y_1 will play tennis or y_1 will not drive a car. For all x, y_1 will drive a car or y_1 will not play tennis. Therefore for all x, y_1 will drive a car if and only if y_1 will play tennis.
forall x: P(x) or ~Q(x). forall x: Q(x) or ~P(x). Therefore forall x: Q(x) <-> P(x).