August 23 rd, 2013.  Variable –  Is a letter that stands for a number  Variable Expression –  Is a mathematical phrase that uses variables, numerals,

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Presentation transcript:

August 23 rd, 2013

 Variable –  Is a letter that stands for a number  Variable Expression –  Is a mathematical phrase that uses variables, numerals, and mathematical symbols

 How many miles can you drive on ten gallons of gas? Vehicle TypeMilesGallonsMiles per Gallon Subcompact ÷ 10 Compact ÷ 10 Mid-Size Sedan ÷ 10 Sport Utility Vehicle ÷ 10 Pickup Truck ÷ 10

 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

 What is the difference between the above expressions?  Can you come up with an example of each?

 We can translate words into variable expressions Word PhraseVariable Expression Nine more than a number yy less than a number n A number z times three A number a divided by 12 5 times the quantity 4 plus a number c

 Bagels cost $0.50 each. Write a variable expression for the cost of b bagels.  Answer :0.50b