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# 02.06.2013 lesson notes

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Covers Say It With Symbols 1.2 and 1.4 In-class Assignment

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### 02.06.2013 lesson notes

1. 1. 3.  Determining Equivalence.notebook February 06, 2013 Determining Equivalence 1
2. 2. 3.  Determining Equivalence.notebook February 06, 2013 Goal: Determine if two or more expressions are equivalent. 2
3. 3. 3.  Determining Equivalence.notebook February 06, 2013 Happy Wednesday! Todays warm­up is Mental Math #1­5. When you are finished, please take out your homework and a red pen. Solve each equation or inequality for the variable: 1) 2x + 2 > 4 2) 2(x + 2) ­ 3x > ­ 2 3) 5(x ­ 3) + 4 = 4) ­ 3(c+4) ­ 2 > 7 5) ­ 9 = 8 + [ 3 ­ (2x + 4)] ­ 6x 3
4. 4. 3.  Determining Equivalence.notebook February 06, 2013 4
5. 5. 3.  Determining Equivalence.notebook February 06, 2013 While I check in your work, please continue working on the following ACE problems: Page 15: 10­12 Page 16: 18­23, 25­32, 46­49 Label the paper you use with your name, date, and "Classwork" and title it "Equivalent Expressions". You may use the same paper as yesterday. 5
6. 6. 3.  Determining Equivalence.notebook February 06, 2013 6
7. 7. 3.  Determining Equivalence.notebook February 06, 2013 s 1 s 1 s 1 1 s 1 s 1 s s 1 s 1 7
8. 8. 3.  Determining Equivalence.notebook February 06, 2013 s s s 1 s 1 s s s 1 1 1 s 1 1 1 8
9. 9. 3.  Determining Equivalence.notebook February 06, 2013 s 1 1 s 1 1 1 s 1 s 1 1 s 1 s s 1 1 s 1 9
10. 10. 3.  Determining Equivalence.notebook February 06, 2013 s 1 1 s 1 1 1 s 1 s s s s 1 s 1 10
11. 11. 3.  Determining Equivalence.notebook February 06, 2013 11
12. 12. 3.  Determining Equivalence.notebook February 06, 2013 12
13. 13. 3.  Determining Equivalence.notebook February 06, 2013 13
14. 14. 3.  Determining Equivalence.notebook February 06, 2013 Key Question: Is plugging in one value to both expressions good enough to determine equivalency? Lets try 2x + 1 and x + 2. Evaluate for x = 1. Are the expressions equivalent? 14
15. 15. 3.  Determining Equivalence.notebook February 06, 2013 Key Question: Is plugging in one value to both expressions good enough to determine equivalency? Lets try 2x + 1 and x + 2 again. This time evaluate for x = 3. Are the expressions equivalent? 15
16. 16. 3.  Determining Equivalence.notebook February 06, 2013 Key Question: Is plugging in one value to both expressions good enough to determine equivalency? This time well use y = 4(x + 2) ­ 4 and y = 4(x + 1). Evaluate for x = 1 and x = 2 Are the expressions equivalent? Do you need at least two values to produce the same answer to confirm that expressions are equivalent? 16
17. 17. 3.  Determining Equivalence.notebook February 06, 2013 Why are two values for x y = 4(x + 2) ­ 4 good enough to determine equivalent expressions? y = 4(x + 1) 17
18. 18. 3.  Determining Equivalence.notebook February 06, 2013 18
19. 19. 3.  Determining Equivalence.notebook February 06, 2013 19
20. 20. 3.  Determining Equivalence.notebook February 06, 2013 Group Work: Problem 1.4 A­E Write neatly and show your work; this will be turned in for credit. No more than two people per group. Groups not working will be split up and work alone. 20