Consider the following premises. forall x_9: P_9(x_9). Can we infer P_9(a_9) or w_2 from them? If possible, name the inference rules being used at each step.
 From forall x_9: P_9(x_9) we can infer P_9(a_9) via universal instantiation. Finally, from P_9(a_9) we can infer P_9(a_9) or w_2 via addition. Therefore, the answer is yes.