# Math Definitions - Letter X

### Chapters

### Definition of x

# Definition of x

When we're doing algebra, we often use \(x\) to represent something that we don't know the value of.

For example, in the equation \(x + 4 = 9\), we don't know the value of \(x\), but we can work it out. It should be \(5\).

We call \(x\) an "unknown", or a "variable".

Variables don't have to be called "\(x\)". They can be called anything you like. Letters or symbols like "y" and "a" are more common, but \(x\) can be anything you like - even "Murgatroyd" or "Engelbert"

### Description

The aim of this dictionary is to provide definitions to common mathematical terms. Students learn a new math skill every week at school, sometimes just before they start a new skill, if they want to look at what a specific term means, this is where this dictionary will become handy and a go-to guide for a student.

### Audience

Year 1 to Year 12 students

### Learning Objectives

Learn common math terms starting with letter X

Author: Subject Coach

Added on: 5th Dec 2017

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