But before we actually begin our derivation, we want to simplify this equation. So instead of using the equation that describes equilibrium, we're going to assume that we're essentially at the beginning of that equation. So right at the start when the time is approximately equal to zero, and at this point in time the velocity of that enzyme is equal to v naught. Now, another important point about the beginning of the reaction is right at the beginning of the reaction we have not yet formed a large amount of products. So right at the beginning what happens is we have that enzyme that binds onto the substrate and this takes place relatively quickly. And so equilibrium is established here between these and this complex quickly because this takes place very quickly.