And in fact, if we can't calculate what v max is, then we cannot calculate what the Km value is, the Macalus constant. So remember, the Mikalus constant basically describes the affinity of that substrate for the active side. And the Km value is the concentration of that substrate at which that enzyme operates at a velocity that is exactly half of that v max value. So if we know what this y coordinate is, v max divided by two, then we can calculate exactly what the Km value is. We simply draw a horizontal line until it hits the curve and then we draw a vertical line and that gives us the x coordinate, the Km value. So if we can't calculate what v max is, because the slope never actually touches the v max value, then we can't calculate what v max divided by two is and therefore we cannot calculate what Km is.