## Algebra## Algebra Explained |

## What is an expression in mathematics? |

An expression in mathematics is a statement that uses either numbers, variables, or both. For example, the following are all mathematical expressions:

*y*

4

6 - 4

5 × *x* - 7

4 + 5 (3 - 2)

*x* + 4 (7 - *x*)

In order to write an expression from a written mathematical problem, one has to interpret the text. For example, one person weighs 100 pounds and another weighs *y* pounds; the expression for their combined weights would be 100 + *y*.