Bellwork 8/18 Do 44 - 54 even on page 7

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

= 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? =

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

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.

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

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

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

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?

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

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

Guided Practice Do 1-6 on page 11

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

Do worksheet 1.2 (1 - 27 Odd) Homework Page 11 Classwork Do worksheet 1.2 (1 - 27 Odd) Homework Page 11 Do (8 - 20 ev.) and (25, 27 & 43 )