Essentially, we take the curve and we shift it upward. And notice the slope doesn't change because these lines are parallel. What changes is the X coordinate value, where the line intersects the X axis and the Y coordinate value, the Y intercept. Now, why does that actually take place? Well, recall what an uncompetitive inhibitor does. An uncompetitive inhibitor binds onto that side of the enzyme that is only created when the substrate actually binds onto that particular enzyme.