Learn how to simplify rational expressions by canceling factors that are shared by the numerator and the denominator. Sometimes this calls for factoring the numerator and the denominator in various ways.
Learn about direct and inverse variation, which are two types of relationships between two quantities. Direct variation is simply a proportional relationship, but inverse variation is more complicated and interesting. Gain some experience with it before we dive deeper into the world of rational functions.
Learn about the ways in which rational functions behave when their denominator is equal to zero. This gets interesting when vertical asymptotes are involved! Learn how to determine this behavior for any kind of rational function.