1. Do Now 10/19/10 Take out HW from last night. Take out HW from last night. Text p.66, #16-26 even, 28-31 all, 32- 46 evens Text p.66, #16-26 even, 28-31 all, 32- 46 evens Copy HW in your planner. Copy HW in your planner. Text p. 80-81, #1-5 all, #10-15 all; Do not simplify expressions. Text p. 80-81, #1-5 all, #10-15 all; Do not simplify expressions. Quiz sections 2.1 & 2.3 Friday Quiz sections 2.1 & 2.3 Friday In your journal, compare and contrast a mathematical expression (number sentence) and a regular “word” sentence. In your journal, compare and contrast a mathematical expression (number sentence) and a regular “word” sentence. For example: “5 + 8 + 4 ” and “See spot run.” For example: “5 + 8 + 4 ” and “See spot run.”

2. Homework Text p.66, #16-26 even, 28-31 all, 32- 46 evens 16) 56 16) 56 18) 7 18) 7 20) -180 20) -180 22) 4 22) 4 24) x + 29 24) x + 29 26) -48c 26) -48c 28) identity property of addition 28) identity property of addition 29)commutative property of multiplication 29)commutative property of multiplication 30) associative property of addition 30) associative property of addition 31) identity property of multiplication 31) identity property of multiplication 32) 21,120 ft 32) 21,120 ft 34) 6 minutes 34) 6 minutes 36) 308 Calories 36) 308 Calories 38) 220,000 lb 38) 220,000 lb 40) No. You must always put on your socks before your shoes 40) No. You must always put on your socks before your shoes 42) 110 42) 110 44) 300 44) 300 46) 27 46) 27

3. Objective SWBAT identify the parts of variable expressions SWBAT identify the parts of variable expressions

4. Parts of an Expression -3x + 2x + 8 Terms of the expression are separated by addition signs Section 2.3 “Simplifying Variable Expressions” -4x – 3x + 7 Write expression as a sum “Opp-Opp” -4x + (-3x) + 7

5. Parts of an Expression -3x + 2x + 8 Coefficient the number part of a variable term -x – 3x + 7 Write expression as a sum “Opp-Opp” -1x + (-3x) + 7 The coefficient is always 1 for a variable with no number in front of it.

6. Parts of an Expression -3x + 2x + 8 Constant term that has no variable 12x – 3 + x + 7 Write expression as a sum “Opp-Opp” 12x + (-3) + x + 7

7. Parts of an Expression -3x + 2x + 8 12x – 3 + 2x + 7 Write expression as a sum “Opp-Opp” 12x + (-3) + 2x + 7 Like Terms terms that have the same variable -3x + 2x -3x + 2x Constant terms are like terms.

8. Parts of an Expression 7x + 5 + 3x + 8 1) List the terms of the expression. 2) List the coefficients of the expression. 4) List the like terms of the expression. 3) List the constant terms of the expression. 7x, 5, 3x, 8 7, 3 7x & 3x ; 5 & 8 8

9. Parts of an Expression y + 8 – 5y – 3 1) List the terms of the expression. 2) List the coefficients of the expression. 4) List the like terms of the expression. 3) List the constant terms of the expression. 1y, 8, -5y, -3 1, -5 1y & -5y ; 8 & -3 8, -3 Write expression as a sum “Opp-Opp” “Opp-Opp” 1y + 8 + (-5y) + (-3) The coefficient is always 1 for a variable with no number in front of it.

10. Challenge Simplify the Expression 7x + 5 + 3x + 8 Can you make it easier to read? 7x + 3x + 5 + 8 10x + 13

11. Homework - Text p. 80-81, #1-5 all, #10-15 all; Do not simplify expressions. 24