Consider the following premises. For all x_16, x_16 is a writer if and only if x_16 will drive a car. Linda is driving a car and Susan is sleeping. Can we infer the following from them? If we can, name the inference rule being used: Linda is a writer.
 From the fact that for all x_16, x_16 is a writer if and only if x_16 will drive a car we can infer that Linda is a writer if and only if Linda is driving a car via universal instantiation. From the fact that Linda is a writer if and only if Linda is driving a car we can infer that if Linda drives a car, then Linda is a writer via biconditional elimination. From the fact that Linda is driving a car and Susan is sleeping we can infer that Linda is driving a car via simplification. Finally, from the fact that if Linda drives a car, then Linda is a writer, and that Linda is driving a car we can infer that Linda is a writer via modus ponens. Therefore, the answer is yes.