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Algebraic Expressions

Algebraic Expressions. What is a Variable?. In algebra, we use LETTERS or SYMBOLS to represent a number. Examples: x y n. What is an algebraic expression?. When we combine one or more variables; It can include NUMBERS and OPERATION SIGNS. Examples:

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Algebraic Expressions

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  1. Algebraic Expressions

  2. What is a Variable? • In algebra, we use LETTERS or SYMBOLS to represent a number • Examples: x y n

  3. What is an algebraic expression? • When we combine one or more variables; • It can include NUMBERS and OPERATION SIGNS • Examples: x + y 3 – x 4x 6 + xy

  4. Expressions that involve addition • The sum of 2 and x • 8 increased by 2 • 7 more than v • 6 greater than x • Exceeds L by 20

  5. Expressions that involve subtraction • The difference of 2 and y • c decreased by 2 • 7 less than v • 6 reduced by x • 20 less L

  6. Expressions that involve multiplication • The product of 2 and 5 • 10 times x • Twice y • Triple z • ½ of a number t

  7. Expressions that involve division • The quotient of 20 and 5 • T divided by 4 • x split into 12 parts

  8. Math in our everyday lives • Johnny babysits his neighbour’s kids after school and receives $5.50 each hour. • Johnny really, REALLY wants to buy an XBOX 360 which is priced at $569 (with tax). • If Johnny works 82 hours, will he have enough money to purchase the XBOX 360?

  9. Math in our everyday lives IN: 1 hour, Johnny makes $5.50 2 hours: Johnny makes $11.00 3 hours: Johnny makes $16.50 … The algebraic expression 5.50xgives us how much money Johnny earns in x hours. How much money does he earn in 82 hours? $5.50 x 82 = $451 … not enough 

  10. homework • “Do You Remember?” section of Chapter 4 • Page 123 #1-7

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