Consider the following premises. For all z, z is an artist if and only if z is poor. For all z, z is an artist if and only if z is poor. Can we infer the following from them? If we can, name the inference rule being used: For all z, if z were an artist, then z is poor.
 From the fact that for all z, z is an artist if and only if z is poor we can infer that for all z, if z were poor, then z is an artist via universal biconditional elimination. Finally, from the fact that for all z, z is an artist if and only if z is poor we can infer that for all z, if z were an artist, then z is poor via universal biconditional elimination. Therefore, the answer is yes.