What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: If Linda were a server, then Jessica is playing tennis. Michael is taking a plane if and only if Jessica is playing tennis. Linda is a server or Michael is taking a plane.
If Michael takes a plane, then Jessica is playing tennis can be inferred via the biconditional elimination rule. If Jessica plays tennis, then Michael is taking a plane can be inferred via the biconditional elimination rule.