Final answer:
A plane in mathematics is a two-dimensional flat surface that extends infinitely in all directions and is represented by an equation involving two variables.
Step-by-step explanation:
A plane, in the context of mathematics, does not consist of infinite numbers. Instead, a plane is a two-dimensional flat surface that extends infinitely in all directions. It can be represented by an equation in Cartesian coordinates, which involves two variables. For example, the equation of a plane in three-dimensional space is ax + by + cz + d = 0, where a, b, c, and d are constants.