august 23 rd 2013
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Ch. 1-1 Variables and Expressions

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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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Presentation Transcript
definitions
Definitions
  • Variable –
    • Is a letter that stands for a number
  • Variable Expression –
    • Is a mathematical phrase that uses variables, numerals, and mathematical symbols
example
Example
  • How many miles can you drive on ten gallons of gas?
example cont
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
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
Writing Variable Expressions
  • We can translate words into variable expressions
quick check
Quick Check
  • Bagels cost $0.50 each. Write a variable expression for the cost of b bagels.
    • Answer : 0.50b
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