8th alg -l2.5
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The document provides instructions and examples for solving absolute value equations and evaluating absolute value expressions. It begins with assigning practice problems from the textbook and noting an upcoming test date. It then provides examples of evaluating absolute value expressions when given values for variables. Next, it explains how to solve absolute value equations by considering both cases where the absolute value is equal to the number or its opposite. Students are shown how to graph the solution sets on a number line. Finally, it asks students to write absolute value equations for two graphs.
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![Lesson 25.notebook September 12, 2013
Assignment:
1>L2.5, pg. 105106, #236 [evens...skip #10] Due Tomorrow (9/13)
2>Chapter 2 Test Friday (9/20)](https://image.slidesharecdn.com/8thalg-l2-130912101600-phpapp02/85/8th-alg-l2-5-1-320.jpg)
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8th alg -l2.5
- 2. Lesson 25.notebook September 12, 2013 Lesson 2.5 WarmUp: Solve each equation. Show all work for full credit. 1) 1.3c = 3.3c + 2.8 2) 2(4r + 6) = 2/3(12r + 18) 3) 12 4/5(x + 15) = 4 4) 7 3r = r 4(2 + r) 5) 2/5m = 1/3(2m 12)
- 3. Lesson 25.notebook September 12, 2013 Lesson 2.5: *To evaluate absolute value expressions...plug in the value(s) for the variable (s) and simplify. *To solve absolute value equations...we must consider both possible "cases"... >|x| = 5 the solution is: 5 and 5 *So... For any real numbers a and b, if |a| = b, then a = b or a = b And.... |a + b| = c, then a + b = c or a + b = c And...the solutions can be graphed on a number line.
- 4. Lesson 25.notebook September 12, 2013 Lesson 2.5 examples: Evaluate each expression: A) |3 h| + 13, if h = 5 B) |f + g| h, if f = 3, g = 4 and h = 5 C) a + |2x a|, if a = 2 and x = 2.1
- 5. Lesson 25.notebook September 12, 2013 Solve each equation. Graph the solution set. D) |y + 2| = 4 E) |3n 4| = 1
- 6. Lesson 25.notebook September 12, 2013 F) 2|y| 3 = 8 G) 4 3|x| = 10
- 7. Lesson 25.notebook September 12, 2013 Write an equation involving absolute value for each graph. H) I) 10 2 3 4 5 6 7 8 9 1012345678910 10 2 3 4 5 6 7 8 9 1012345678910