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Do Now 9/15/11 Take out HW from last night. Take out HW from last night.  Text p. 17, #1-4 Copy HW in your planner. Copy HW in your planner.  Text p. 20, #10-36 evens, #40 & 41  POTW#1 In your journal, 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. In your journal, 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.

Text p. 17, #1-4 all 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.

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Constant a number in an expression that does not change.

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

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

Evaluate the Expression PEMDAS 4(3) x + 2 x = 3 Substitute

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

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

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

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

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

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

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