Consider the following premises. For all x_9, x_9 is not fast. For all x_9, x_9 will take a plane if and only if x_9 is fast. For all x_9, if x_9 drives a car, then x_9 is poor. For all x_9, if x_9 were poor, then x_9 is taking a plane. Can we infer the following from them? If we can, name the inference rule being used: For all x_9, x_9 will not drive a car.
 From the fact that for all x_9, if x_9 drives a car, then x_9 is poor, and that for all x_9, if x_9 were poor, then x_9 is taking a plane we can infer that for all x_9, if x_9 drives a car, then x_9 is taking a plane via universal transitivity. From the fact that for all x_9, x_9 will take a plane if and only if x_9 is fast we can infer that for all x_9, if x_9 takes a plane, then x_9 is fast via universal biconditional elimination. From the fact that for all x_9, if x_9 takes a plane, then x_9 is fast, and that for all x_9, x_9 is not fast we can infer that for all x_9, x_9 will not take a plane via universal modus tollens. Finally, from the fact that for all x_9, if x_9 drives a car, then x_9 is taking a plane, and that for all x_9, x_9 will not take a plane we can infer that for all x_9, x_9 will not drive a car via universal modus tollens. Therefore, the answer is yes.