1. Algebraic Expressions
Lesson 3.3
Algebraic Expressions

2. Definitions In your math notebook, define the following word:
Algebraic expression – an expression that contains a variable. For example, if Maria is 2 inches taller than Joe and if the variable M represents Maria’s height, then the algebraic expression M – 2 represents Joe’s height.
Evaluate an expression – similar to writing a special case for a general pattern—you will replace the variable with a specific value

3. Math Message Using your definitions, answer the following question:
John is 4 years older than Mike. How old is John?

4. Math Message Follow-Up
One way to represent John’s age is to write an algebraic expression in which a variable stands for Mike’s age.
For example, if m represents Mike’s age in years, then m + 4 represents John’s age
An algebraic expression is a group of symbols that states a relationship between quantities and contains at least one variable. It may also contain numbers, operation symbols (+, -, *, /), and grouping symbols (such as parentheses)

5. Let’s try these examples…
Chan weights 15 pounds less than Henry.
If h = Henry’s weight then h – 15 represents Chan’s weight.
Janice has twice as many stamps in her collection as Santiago.
If s = the number of stamps in Santiago’s collection, the 2 * s or 2s, represents the number of stamps in Janice’s collection.
There were one-third as many tests in history class as in Spanish class.
If t = the number of tests in Spanish class, then there were ∗𝑡, 𝑜𝑟 1 3 𝑡, 𝑜𝑟 𝑡 3 tests in history class.

6. With a Partner… Complete pages 89 and 90
MAKE SURE TO READ THE PROBLEM CORRECTLY IN ORDER TO HAVE THE RIGHT ALGEBRAIC EXPRESSION

7. Homework
Math Boxes 3.3
Study Links 3.3