# Coordinate axes of Two-dimensional Space

The number-lines that form a two dimensional Cartesian coordinate system by the perpendicular bisection are called the coordinate axes of the two dimensional space.

## Introduction

A two dimensional Cartesian coordinate system is geometrically formed by the two number-lines, which are bisected perpendicularly at their middle point and each number-line in the two-dimensional space is called a coordinate axis of the two dimensional Cartesian coordinate system. So, there are two coordinate axes in two dimensional space.

### x-axis

The horizontal number line is called the $x$-axis and learn how to use the $x$-axis of bi-dimensional Cartesian coordinate system in geometry.

### y-axis

The vertical number line is called the $y$-axis and learn how to use the $y$-axis of two-dimensional Cartesian coordinate system in geometry.

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