A coordinate plane is a two-dimensional plane formed by the intersection of two lines called the axis. One of these number lines is a horizontal number line called the x-axis and the other number line is a vertical number line called the y-axis. The plane is called two-dimensional because anywhere on this plane where you can put your finger, the location of that point will need two things– its distance on the x-axis and its distance on the y-axis. Solving Coordinate Plane Worksheet is excellent for students to understand where numbers lie in the coordinate plane.