# How do you define a variable and write an algebraic expression for the phrase: 12 less than a number?

##### 1 Answer

Oct 14, 2015

#### Answer:

The expression is

#### Explanation:

So,

But since you don't know which number you need to subtract from, it's a variable, and you can call it as you like, usually

So, using the variable we can write an expression that holds for *any* number, and which always means "take