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. So back in the day before computers, we really had no way of using this graph to actually calculate what v max and Km is. So back in the day, instead of using this Mikhailis Methane equation in this form, we changed the equation into a slightly different form. And what we did was we took the reciprocal of the left side and the right side of that equation.