Ch. 1-1 Variables and Expressions

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# Ch. 1-1 Variables and Expressions - PowerPoint PPT Presentation

August 23 rd , 2013. Ch. 1-1 Variables and Expressions. Definitions. Variable – Is a letter that stands for a number Variable Expression – Is a mathematical phrase that uses variables, numerals, and mathematical symbols. Example. How many miles can you drive on ten gallons of gas ?.

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August 23rd, 2013

### Ch. 1-1 Variables and Expressions

Definitions
• Variable –
• Is a letter that stands for a number
• Variable Expression –
• Is a mathematical phrase that uses variables, numerals, and mathematical symbols
Example
• How many miles can you drive on ten gallons of gas?
Example Cont…
• Suppose you don’t know the number of miles, what can we do?
• Use a variable!
• Let m = the number of miles on 10 gallons
• The variable expression for miles per gallon would therefore be m ÷ 10
Numerical Expression vs. Variable Expression
• What is the difference between the above expressions?
• Can you come up with an example of each?
Writing Variable Expressions
• We can translate words into variable expressions
Quick Check
• Bagels cost \$0.50 each. Write a variable expression for the cost of b bagels.