Answer
The Cartesian plane is described by using two numbers: $(x, y)$.
Work Step by Step
The Cartesian plane consists of two directed lines that perpendicularly intersect their respective zero points. The horizontal directed line is called the $x$-axis and the vertical directed line is called the $y$-axis. The point of intersection of the $x$-axis and the $y$-axis is called the origin and is denoted by the letter $O$.
The position of any point on the Cartesian plane is described by using two numbers: $(x, y)$. The first number, $x$, is the horizontal position of the point from the origin. It is called the $x$-coordinate. The second number, $y$, is the vertical position of the point from the origin. It is called the y-coordinate. Since a specific order is used to represent the coordinates, they are called ordered pairs.
