# What Is an X-Coordinate?

## What Is an X-Coordinate?

The x-coordinate is the first number in the pair of numbers used to describe Cartesian coordinates.

For example, in the Cartesian coordinates **(2, 4)**, the x-coordinate is **2** (the number on the left):

## What Does the X-Coordinate Mean?

The x-coordinate tells you how far **across** the horizontal x-axis a point is on a graph (measured from the origin).

If a point has Cartesian coordinates **(2, 4)**, the point would be **2** units along the x-axis. The image below shows what we mean by a point being 2 units along the x-axis (measured from the origin):

**Note:** The x-axis is labelled with numbers (0, 1, 2, 3...) so you can measure how far across the point is.

## The X-Coordinate Can Be Positive...

If you go **right** along the x-axis (starting at the origin, where it crosses the y-axis), it is labelled with positive numbers (0, 1, 2, 3...).

The x-coordinate of any point to the **right** of the y-axis is **positive**.

Imagine a point had an x-coordinate of **4**. It would be **4** units to the **right** of the y-axis:

## ...Or the X-Coordinate Can Be Negative

If you go **left** along the x-axis (starting at the origin, where it crosses the y-axis), it is labelled with negative numbers (0, −1, −2, −3...).

The x-coordinate of any point to the **left** of the y-axis is **negative**.

Imagine a point had an x-coordinate of **−4**. It would be **4** units to the **left** of the y-axis: