Therefore, we can represent this guy in terms of all these guys. So let's bring the k negative one over and we get the following. Nobr or the concentration of Nobr equals k one divided by k minus one, right times no or concentration of no times the concentration of BR two. And now we want to take this whole guy and plug it into our rate law for our step number two. For our slow step, we plug this guy in and we get the following our rate for the second step, the slow step is equal to k two. This guy times k one.