advertisement

Name: __________________________________________ Date: ___________ Algebra I 1.1 Notes: Variables and Expressions Objective: Translate between words and algebra. Evaluate algebraic expressions. Vocabulary – complete the following chart by writing the four basic operations as the heading for each column and then filling in words associated with those operations. What is a variable? Examples: 1. Write an algebraic expression given each sentence. a. Kenny owns v video games. Stan owns 7 more video games than Kenny. Write an expression for the number of video games Stan owns. b. Jenny is 12 years younger than Candy. Write an expression for Jenny’s age if Candy is c years old. c. Jared can type 35 words per minute. Write an expression for the number of words he Original content Copyright © by Holt McDougal. Additions and changes to the original content are the responsibility of the instructor. Holt McDougal Algebra 1 Name: __________________________________________ Date: ___________ Algebra I can type in m minutes. d. Mr. O’Brien’s commute to work is 0.5 hour less than Miss Santos’s commute. Write an expression for the length of Mr. O’Brien’s commute if Miss Santos’s commute is h hours. e. Mrs. Knighten bought a box of c cookies and split them evenly between the 25 students in her classroom. Write an expression for the number of cookies each student received. f. Enrique collected 152 recyclable bottles, and Latasha collected b recyclable bottles. Write an expression for the number of bottles they collected altogether. g. Tammy’s current rent is r dollars. Next month it will be reduced by $50. Write an expression for next month’s rent in dollars. 2. Write a sentence to match the given algebraic expression. a. 15 b b. x 16 c. (2)(t) d. x9 Evaluating algebraic expressions: Evaluate each expression for x 4, y 6, and z 3. 3. x 15 ______________________________ 4. 3y _____________________________ 5. 15 z ______________________________ Evaluate each expression for x 2, y 18, and z 9. 6. x • z 7. y x 8. y z Original content Copyright © by Holt McDougal. Additions and changes to the original content are the responsibility of the instructor. Holt McDougal Algebra 1 Name: __________________________________________ Date: ___________ ______________________________ y 9. x ______________________________ _____________________________ 10. xy _____________________________ Algebra I ______________________________ 11. z x ______________________________ Original content Copyright © by Holt McDougal. Additions and changes to the original content are the responsibility of the instructor. Holt McDougal Algebra 1