What is defined as a two-dimensional plane formed by the intersection of vertical and horizontal lines?

The correct choice is the coordinate plane, which is defined as a two-dimensional surface created by the intersection of vertical and horizontal lines. In this context, the vertical lines represent the y-axis, while the horizontal lines represent the x-axis. Together, they form a grid that allows for the plotting of points in a two-dimensional space, where each point is defined by its coordinates (x, y).

Within this framework, the coordinate plane facilitates various mathematical concepts, such as graphing functions, visualizing relationships between variables, and solving equations. Each point on the coordinate plane can be identified using an ordered pair, which is represented by two values corresponding to the x and y coordinates.

The other options represent different mathematical concepts that do not describe the intersection of vertical and horizontal lines in the way the coordinate plane does. For example, a linear equation represents a relationship between two variables in a straight-line format, while slope-intercept form refers to a specific way to express linear equations. An ordered pair, while related to the coordinate plane, simply specifies a single point within it rather than describing the plane itself.