Free x and y axis math school topic guide, including step-by-step examples, free practice questions, teaching tips, and more! Learn about the X-axis and Y-axis in a graph, their definitions, equations, and real-life examples. Understand how to read and plot coordinates in the coordinate plane easily. The point of intersection of X-axis, Y-axis and Z-axis in 3D plane is called the Origin. Each point in the 3D cartesian coordinate system is determined using its x, y and z coordinate and represented as (x, y, z). Free x and y axis GCSE maths revision guide, including step by step examples, exam questions and free worksheet.