1. Bellwork 8/18
Do even on page 7

2. Bellwork 8/18
44.) 1/2
46.) .60
48.) 7%
50.) 1.17
52.) 23%
54.) 128

3. = To be able to evaluate variable expressions
Today’s Objective
To be able to evaluate variable expressions
What’s the difference between an expression and an equation? =

4. Expressions compared to Equations
8y, 16a/b, 4r + s, 7
Equations
3x + 4 = 6
3r = 9

5. Variable = A letter or symbol that is used to represent a number
Vocabulary
Variable = A letter or symbol that is used to represent a number
Evaluating an expression = Replacing all the variables in an expression with a number
Value of an expression = The result of the expression when you evaluate it.

6. Steps for evaluating expressions
Write the expression
Substitute the values
Simplify the expression

7. 1.) Evaluate 5x + 4y when x = 3 and y = 2
5(3) + 4(2)
15 + 8 23

8. 2.) Evaluate x + (2x -1) when x = 3
3 + (2(3) - 1)
3 + 5 8

9. What’s the difference between a term and a factor?
Vocabulary
In the expression 3x + 2, 3x and 2 are called terms of the expression.
In the expression 4x , 4 and x are called factors of the expression.
What’s the difference between a term and a factor?

10. Substitute 75 for r and 1.5 for t
3.) Find the distance traveled using the distance formula d = rt, when r = 75 & t = 1.5
Substitute 75 for r and 1.5 for t
d = rt
d =(75)(1.5)
d = 112.5

11. Work with a partner and do (a-f) on the bottom of page 10
A.) True
B.) True
C.) False x = 7
D.) True
E.) True
F.) False b = 7

12. Guided Practice
Do 1-6 on page 11

13. Guided Practice 1.) r divided by 3s 2.) 6x + y 3.) 24 4.) 7 5.) 7
6.) 16 (6,1) or (0,4)….

14. Do worksheet 1.2 (1 - 27 Odd) Homework Page 11
Classwork
Do worksheet ( Odd)
Homework Page 11
Do ( ev.) and (25, 27 & 43 )