An asymptote is a line that a curve becomes arbitrarily close to as a coordinate tends to infinity. The simplest asymptotes are horizontal and vertical. In these cases, a curve can be closely approximated by a horizontal or vertical line somewhere in the plane. Some curves, such as rational functions and hyperbolas, can have slant, or oblique, asymptotes, which means that some sections of the curve are well approximated by a slanted line.
Find horizontal, vertical and slant asymptotes of rational functions and more.