#### WebQuest

# Math Refresher

#### Conclusion

**EQUATIONS**

**In mathematics, a**

**variable**is a letter which can represent a variety of different numbers. For example:

**p = 2.2k**. This can be used to convert a weight from kilograms (k) to pounds (p). Since you could substitute different numbers in for

**k**it is called a variable.

The formula we just looked at is called an

**equation**because it

__contains an equal sign__with something on both sides.

A combination of variables and numbers using the operations of addition/subtraction, and multiplication/division

__without an equal sign__or if there is an equal sign,without something on both sides of the equal sign, is known as an

**expression**.

If an equation had a solution that means there is a number that could be substituted in place of the variable that would

*balance*each side of the equation.

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