1. Warm Up Problem
Forest counted the number of sports cards he has collected. The table shows the results.
Write a ratio in simplest form that compares the number of basketball cards to the number of soccer cards. Then explain its meaning.
Baseball
Basketball
Football
Soccer 45 14 20 21

2. Algebra: Write Expressions
Lesson 6-4

3. Objectives I can write verbal phrases as simple algebraic expressions.
I can define a variable.

4. Vocabulary
defining a variable – choosing a letter to represent an unknown

5. Example 1
Write the phrase as an algebraic expression. Eight dollars more than Ryan earned

6. Ten dollars less than the original price
Example 2
Write the phrase as an algebraic expression.
Ten dollars less than the original price

7. Four times the number of gallons
Example 3
Write the phrase as an algebraic expression.
Four times the number of gallons

8. Got It?
Write an expression for each situation. 1) four points fewer than the Bulls scored b = bulls score expression: _________ 2) 12 times the number of feet f = feet expression: _________ 3) the total cost of a shirt and an $8 pair of socks s = shirt expression: _________

9. Example 4
Write the phrase “5 less than 3 times the number of points” as an algebraic expression

10. Got It?
4) Write the phrase “$3 more than four times the cost of a pretzel” as an algebraic expression. c = ____________ expression: ___________

11. Example 5
Terry bought a magazine for $5, and 2 bottles of nail polish. Write an expression to represent the total amount she spent. Then find the total amount if each bottle of nail polish cost $3. Step 1: 2 bottles of nail polish plus $5 Step 2: let n = nail polish Step 3: 2n + 5 To solve, insert 3 for n. 2(3) + 5 = 6+5 = $11

12. Got It?
5) Shoko bought a box of popcorn for $3.50 and three medium drinks. Define a variable and write an expression to represent the total amount she spent. Then find the total amount if one drink costs $1.50.

13. Homework Hints:
#8. There are two numbers/variables…x and 1.2. Think: Am I going to add, subtract, multiply or divide these numbers? 1 Euro = 1.2 Dollars #12. If one of the expression was n + 8, it could be written as “8 more songs”. If it was 8n, it could be written as “8 times the number of songs”.