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Do Now 9/18/12 Take out HW from last night. Copy HW in your planner. Text p. 17, #1-4 Copy HW in your planner. Text p. 20, #10-36 evens, #40 & 41 POTW#1 In your journal section, list as many examples that you can of quantities (numbers in real-life) that change. Then make a second list of quantities that never change. Use examples from your own life.

Homework Text p. 17, #1-4 all 1). 3 x 2 = 6 hours 2). 18 ÷ 3 = 6 students 3). 48 ÷ 4 = 12 percussion instruments 4). 7 x 4 = 28 students

Objective SWBAT evaluate variable expressions.

Section 1.3, “Variables and Algebraic Expressions” a letter used to represent one or more numbers. a y e t k s m

Constant a number in an expression that does not change.

Algebraic expression consists of one or more variables, operations, and constants. e ÷ 6 y – 7 9 + a 3t + 2y 2k - 7 3m

To EVALUATE A VARIABLE EXPRESSION- substitute a number for each variable, perform the operations and simplify, if necessary. 13· n Substitute 3 for n. 13· 3 Multiply. 39

Evaluate the Expression PEMDAS 4(3) + 2 Substitute 12 + 2 14

Evaluate the Expression x = 3 and y = 4 3 + 2y PEMDAS x 3 + 2(4) Substitute 3 1 + 8 9

Evaluate the Expression 4(x + y) x = 3 and y = 5 PEMDAS 4(3 + 5) Substitute 4(8) 32

Evaluate the Expression ² 3(x + y) x = 2 and y = 5 PEMDAS ² 3(2 + 5) Substitute ² 3(7) 3(49) 147

Evaluate the Expression x = 2 and y = 5 6y PEMDAS Grouping symbol 12 – x Substitute (6 · 5) ÷ (12 – 2) 30 ÷ 10 3

Evaluate the Expression ³ [w(x + z)] + y w = 3, x = 4, y = 2, & z = 6 ³ [3 · (4 + 6)] + 2 PEMDAS ³ [3 · 10] + 2 ³ 30 + 2 30 + 8 38

Evaluate the Expression ² 5x + z x = 4, z = 6 ² 5(4) + 6 PEMDAS 5 · 16 + 6 80 + 6 86

24 Homework Text p. 20, #10-36 evens, #40 & 41