What is the horizontal asymptote, and what does it mean? The equation of the horizontal asymptote is y = 100,000, which means about 100,000 people dressed up as Princess Dawn for several years after the movie premiered. The equation of the horizontal asymptote is y = 100,000, which means that a minimum of 100,000 dress up as Princess Dawn. The equation of the horizontal asymptote is y = 9, which means that no one is dressing up as Princess Dawn 9 years after the movie is released. The equation of the horizontal asymptote is y = 0, which means that eventually, no one will dress up as Princess Dawn