Consider the following premises. Karen is an artist if and only if Charles is taking a plane. If Linda makes tea, then Charles is taking a plane. Karen is an artist. Can we infer the following from them? Charles is not taking a plane.
 From the fact that Karen is an artist we can infer that Karen is an artist or Linda is making tea. From the fact that Karen is an artist if and only if Charles is taking a plane we can infer that if Karen were an artist, then Charles is taking a plane. Finally, from the fact that if Karen were an artist, then Charles is taking a plane, that if Linda makes tea, then Charles is taking a plane, and that Karen is an artist or Linda is making tea we can infer that Charles is taking a plane, which contradicts that Charles is not taking a plane. Therefore, the answer is no.