# How to write algebraic notation

Algebra uses letters to represent unknown values.

Unknown values are commonly represented by the letters

*x*and*y*.There are several principles you need to know to be able to use algebraic notation.

## How does algebraic notation work?

Let's say that **x = 5** and **y = 10** in the following equations.

Therefore...

**x + 2 = 7****3x = 15**(when multiplying don't include the multiplication symbol)**3x + 2 = 17****x² = 25****4x² = 100****xy = 50****2xy = 100**

## Where next?

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