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Published byShanon Griselda Parker Modified over 4 years ago

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AIM: Solving Compound Inequalities Do Now: Graph each set of inequalities on one number line. 1.c < 8; c ≥ 10 2.t ≥ –2; t ≤ –5

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Objectives The student will be able to: 1. solve compound inequalities. 2. graph the solution sets of compound inequalities. SOL: A.1, A.3 Designed by Skip Tyler, Varina High School

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Big Idea: What is the difference between and and or ? AND means intersection -what do the two items have in common? OR means union -if it is in one item, it is in the solution A AB B

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1) Graph x < 4 and x ≥ 2 342 ● a) Graph x < 4 b) Graph x ≥ 2 342 o c) Combine the graphs ● 342 o d) Where do they intersect? ● 342 o

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2) Graph x < 2 or x ≥ 4 342 ● a) Graph x < 2 b) Graph x ≥ 4 342 o c) Combine the graphs 342 o 342 ●

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3) Which inequalities describe the following graph? -2-3 o o Answer Now 1.y > -3 or y < -1 2.y > -3 and y < -1 3.y ≤ -3 or y ≥ -1 4.y ≥ -3 and y ≤ -1

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Classwork: Complete the assignment using your notes from today. If you have a question raise your hand When you finish, answer the summary questions This will be collected for a grade

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Summary: What is a compound inequality? What is the difference between an “and” and an “or”?

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When written this way, it is the same thing as 6 < m AND m < 8 It can be rewritten as m > 6 and m < 8 and graphed as previously shown, however, it is easier to graph everything between 6 and 8! 4) Graph the compound inequality 6 < m < 8 786 o o

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5) Which is equivalent to -3 < y < 5? 1.y > -3 or y < 5 2.y > -3 and y < 5 3.y 5 4.y 5 Answer Now

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6) Which is equivalent to x > -5 and x ≤ 1? 1.-5 < x ≤ 1 2.-5 > x ≥ 1 3.-5 > x ≤ 1 4.-5 < x ≥ 1 Answer Now

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7) 2x < -6 and 3x ≥ 12 1.Solve each inequality for x 2.Graph each inequality 3.Combine the graphs 4.Where do they intersect? 5.They do not! x cannot be greater than or equal to 4 and less than -3 No Solution!! -30-6 o -30-6 o 471 o ● 471 o ●

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8) Graph 3 < 2m – 1 < 9 Remember, when written like this, it is an AND problem! 3 < 2m – 1 AND 2m – 1 < 9 Solve each inequality. Graph the intersection of 2 < m and m < 5. 05 -5

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9) Graph x < 2 or x ≥ 4 05 -5

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10) Graph x ≥ -1 or x ≤ 3 The whole line is shaded!!

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