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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.
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