# 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