The xy-plane, also known as the Cartesian plane or coordinate plane, is a two-dimensional plane formed by two perpendicular number lines called the x-axis and y-axis. It is used to represent points in space using coordinates (x, y).
Pairs of numbers (x, y) that specify the position of a point on the xy-plane.
Origin: The point (0, 0) where the x-axis and y-axis intersect.
Quadrants: Four regions into which the xy-plane is divided by its axes.