Translate the following inference to logic notation: Elisabeth is not an artist. For all x, z will drive a car if and only if z is an artist. For all x, x_20 is a mechanic. Therefore Elisabeth is not driving a car and Joseph is a mechanic.
~P(a). forall x: Q(x) <-> P(x). forall x: R(x). Therefore ~Q(a) and R(b).