This document discusses identifying and assigning variables in algebra. It defines key terms like variable, expression, equation, and inequality. It provides examples of assigning variables to word problems and writing the corresponding equations. These include problems about the weight of a truck and car, gallons and quarts, and the mass of Jupiter and Earth. It also shows how to write equations from tables of values involving tapes and cost, hours and pay, gallons and miles, and pizzas eaten and left. The document reviews the important vocabulary and restates the essential question.

1. Identify and assign variables 10/25/09 Algebra 1.1 Bitsy Griffin

2. Essential Question How do I identify and assign variables? 10/25/09 Algebra 1.1 Bitsy Griffin

3. Vocabulary Equations & Inequalities Complete mathematical sentences. Term (Terms) # Variable Product/quotient of a number Product/quotient of a number & variable Separated by a + or a - 10/25/09 Algebra 1.1 Bitsy Griffin

4. Term Examples 10/25/09 Algebra 1.1 Bitsy Griffin

5. # of Terms? 10/25/09 Algebra 1.1 Bitsy Griffin

6. Problem 1 The weight of the truck is two times the weight of the car. Assign the Variables: Truck Car Is Equation 10/25/09 Algebra 1.1 Bitsy Griffin > T > C > = > 2C=T OR T=2C

7. Problem 2 Four quarts are equal to one gallon. Assign the variables: Quarts Gallons Equation 10/25/09 Algebra 1.1 Bitsy Griffin > Q > G > 4Q=G OR G=4Q

8. Problem 3 The mass of Jupiter is 317.8 times the mass of Earth. Assign the variables Write the equation > J=317.8 E 10/25/09 Algebra 1.1 Bitsy Griffin

9. Write Equations 1 Tapes= Cost= Equation = 10/25/09 Algebra 1.1 Bitsy Griffin T C C=7.50T Tapes Cost 1 7.50 2 15.00 3 22.50 4 30.00

10. Write Equations 2 Hours= Pay= Equation = 10/25/09 Algebra 1.1 Bitsy Griffin H P P=7H Hours Pay 4 28.00 6 42.00 8 56.00 10 70.00

11. Write Equations 3 Gallons= Miles= Equation = M=25G This is an odd equation. We usually think in miles per gallon. 10/25/09 Algebra 1.1 Bitsy Griffin Gallons Miles 3 75 5 125 7 175 9 225

12. Write Equations 4 Pizzas Eaten= Pizzas Left = Equation = 10/25/09 Algebra 1.1 Bitsy Griffin PE PL PL=25 - PE This one wasn’t so easy! I had to notice that it was subtraction! Pizzas Eaten Pizzas Left 0 25 6 19 9 16 18 7

13. Review Variable Expression Equation Variable Expression Term Inequality 10/25/09 Algebra 1.1 Bitsy Griffin

14. Essential Question How do I identify and assign variables? 10/25/09 Algebra 1.1 Bitsy Griffin