But as we continue increasing the concentration of S, we see that the slope begins to decrease and the curve begins to level off. And eventually it approaches asymptotically the maximum velocity of that enzyme given by the red curve asymptotically means the blue curve never actually crosses that red line. So that horizontal red line basically describes the maximum rate of activity of that enzyme at which the enzyme can actually operate on that substrate and transform it into some type of product. This is what the blue curve actually describes. So to see this in equation form, let's take a look at the following equation. This equation basically describes what has taken place inside that beaker once we add the substrate.