So the rate law going this way is given to us by K minus one multiplied by the concentration of this should be the enzyme substrate complex. And that is equal to going this way. So K one multiplied by the concentration of the enzyme and the concentration of the substrate. So this we obtained by assuming that this was at equilibrium. And that's a good assumption because this reaction takes place very quickly. Now, we could basically solve for K minus one divided by K. So we basically take this, we bring it to this side, take this, bring it to this side, and we get this proportion.