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.