**Variables**

**Variables In Algebra**

**What is a variable?**

A variable is something that can vary.

Examples of variables are:

The number of people in a bus.

The number of millemetres of rain in a day.

The number of correct answers in a test.

**How do we show a variable?**

We usually represent a variable by a letter.

We can use any letter

but x is the letter used very often.

Examples:

Let x be the number of people in a bus.

Let y be the number of millemetres of rain in a day.

Let z be the number of correct answers in a test.

Notice that we must be able to

count or measure a variable.

Examples:

**We can count**

the number of people in a bus.

We can measure

the number of millemetres of rain in a day.

We can count

the number of correct answers in a test.

the number of people in a bus.

We can measure

the number of millemetres of rain in a day.

We can count

the number of correct answers in a test.