1. Expressions and Variables

2. Objective and Essential Question By the end of this lesson, you will be able to answer the question: How do you write and solve variable expressions?

3. Key Vocabulary Numerical Expression: consists of numbers and operations Variable: a variable used to represent one or more numbers Variable expression: consists of numbers variables and operations Evaluate: to find the value of a numerical or algebraic expression

4. Example 1

5. Example 2 Evaluate the expression when x=10 and y=4 A. x+y B. xy

6. Example 3 You plan to divide the 120 players in a baseball league into teams with the same number of players. Use a verbal model to write a variable expression for the number of teams if you know the number of players on each team.