1. Algebraic Expressions and Substitutions

2. 2r VOCABULARY Letter used to represent an unknown value. Variable:
Number before or in front of
a variable, which is multiplied with the variable.
Coefficient: 2r

3. r + 2r + 3r r + 2r + 3r = 42 VOCABULARY
Combination of math symbols, but not the equal sign! Simplify only.
Expression:
Includes an equal sign and must solve for the value of the variable.
Equation:
r + 2r + 3r
r + 2r + 3r = 42

4. Words for Operations
Write an algebraic expression for each word expression.
The difference of 2 and b.
The product of -8 and a number.
A number increased by nine.
Twice a number.

5. Words for Operations
Write an algebraic expression for each word expression.
Four less than a number.
A number divided by six.
Twice a number, decreased by nine.
Twice a number, increased by eight.

6. On your white boards, try
#1-5 on pg 11

7. Evaluate Expressions
Evaluate each expression for the given value of x. , when

8. Evaluate Expressions
Evaluate each expression for the given value of x. , when

9. Evaluate Expressions
Evaluate each expression for the given value of x. , when

10. On your white boards, try
#1-4 on pg 12