Evaluating Algebraic Expressions 3-6 Solving Inequalities by Adding or Subtracting Warm Up Warm Up California Standards California Standards Lesson Presentation Lesson PresentationPreview

Evaluating Algebraic Expressions 3-6 Solving Inequalities by Adding or Subtracting Warm Up Compare. Use –3 – –2.74. –8 –7 Solve y = 166. m – 7 = –3 = 8 + w8. 7 = t + 10 < > > < 1221 –11–3

Evaluating Algebraic Expressions 3-6 Solving Inequalities by Adding or Subtracting AF4.0 Students solve simple linear equations and inequalities over the rational numbers. California Standards

Evaluating Algebraic Expressions 3-6 Solving Inequalities by Adding or Subtracting When you ADD OR SUBTRACT the same number on both sides of an inequality, the resulting statement will still be true. –2 < < 12 You can find solution sets of inequalities the same way you find solutions of equations, by ISOLATING THE VARIABLE

Evaluating Algebraic Expressions 3-6 Solving Inequalities by Adding or Subtracting Solve and graph the inequality. x + 3 > –5 –3 x > –8 Since 3 is added x, subtract 3 from both sides. –9 8 –7 6 5 4 3 2 

Evaluating Algebraic Expressions 3-6 Solving Inequalities by Adding or Subtracting Check x + 3 > –5 –4 + 3 > –5 ? –1 > –5 ? Substitute –4 for x. According to the graph –4 should be a solution and –9 should not be a solution. So –4 is a solution. x + 3 > –5 –9 + 3 > –5 ? –6 > –5 ? Substitute –9 for x. So –9 is not a solution. 

Evaluating Algebraic Expressions 3-6 Solving Inequalities by Adding or Subtracting m – 4 ≥ –2 + 4 m ≥ 2 Since 4 is subtracted from m, add 4 to both sides. – Solve and graph the inequality.

Evaluating Algebraic Expressions 3-6 Solving Inequalities by Adding or Subtracting r + 3 ≤ –3 – 3 –3 r ≤ –6 Since 3 is added to r, subtract 3 from both sides. –9 8 –7 6 5 4 3 2  Solve and graph the inequality.

Evaluating Algebraic Expressions 3-6 Solving Inequalities by Adding or Subtracting 5 > n + 1 Since 1¼ is added to n, subtract 1¼ from both sides. Solve and graph the inequality > n – > n 1212 –7 6 –5 4 3 2 

Evaluating Algebraic Expressions 3-6 Solving Inequalities by Adding or Subtracting Solve and graph the inequality. x + 4 > –2 –4 x > –6 Since 4 is added x, subtract 4 from both sides. –9 8 –7 6 5 4 3 2 

Evaluating Algebraic Expressions 3-6 Solving Inequalities by Adding or Subtracting Check x + 4 > – > –2 ? 6 > –2 ? Substitute 2 for x. According to the graph 2 should be a solution and –8 should not be a solution. So 2 is a solution. x + 4 > –2 –8 + 4 > –2 ? –4 > –2 ? Substitute –8 for x. So –8 is not a solution. 

Evaluating Algebraic Expressions 3-6 Solving Inequalities by Adding or Subtracting w – 8 ≥ –3 + 8 w ≥ 5 Since 8 is subtracted from w, add 8 to both sides. – Solve and graph the inequality.

Evaluating Algebraic Expressions 3-6 Solving Inequalities by Adding or Subtracting c + 6 ≤ –1 – 6 c ≤ –7 Since 6 is added to c, subtract 6 from both sides. –9 8 –7 6 5 4 3 2  Solve and graph the inequality.

Evaluating Algebraic Expressions 3-6 Solving Inequalities by Adding or Subtracting 3 > n + 1 Since 1 is added to n, subtract 1 from both sides. Solve and graph the inequality > n – > n 1313 –7 6 –5 4 3 2 

Evaluating Algebraic Expressions 3-6 Solving Inequalities by Adding or Subtracting While training for a race, Ann’s goal is to run at least 3.5 miles each day. She has already run 1.8 miles today. Write and solve an inequality to find out how many more miles she must run today. Additional Example 2: Sports Application Let m = the number of additional miles m ≥ 3.5 –1.8 m ≥ 1.7 Ann should run at least 1.7 more miles. Since 1.8 is added to m, subtract 1.8 from both sides. 1.8 miles plus additional miles is at least 3.5 miles m ≥ 3.5

Evaluating Algebraic Expressions 3-6 Solving Inequalities by Adding or Subtracting 2 is greater than 1.7. Substitute 2 for m. Check Additional Example 2 Continued m ≥ ≥ 3.5 ? 3.8 ≥ 3.5 ? x 1 is less than 1.7. Substitute 1 for m m ≥ ≥ 3.5 ? 2.8 ≥ 3.5 ?

Evaluating Algebraic Expressions 3-6 Solving Inequalities by Adding or Subtracting Tim’s company produces recycled paper. They produce 60.5 lb of paper each day. They have already produced at least 20.2 lb today. Write and solve an inequality to find out how many more pounds Tim’s company must produce. Check It Out! Example 1 Let p = the number of additional pounds of paper p ≥ 60.5 –20.2 –20.2 p ≥ 40.3 Tim’s company should produce at least 40.3 lb more of paper. Since 20.2 is added to p, subtract 20.2 from both sides lbs plus additional pounds is at least 60.5 lb p ≥ 60.5

Evaluating Algebraic Expressions 3-6 Solving Inequalities by Adding or Subtracting 41 is greater than Substitute 41 for p. Check Check It Out! Example 2 Continued p ≥ ≥ 60.5 ? 61.2 ≥ 60.5 ? x 40 is less than Substitute 40 for p p ≥ ≥ 60.5 ? 60.2 ≥ 60.5 ?

Evaluating Algebraic Expressions 3-6 Solving Inequalities by Adding or Subtracting Lesson Quiz: Part I Solve and graph each inequality. 1. g – 7 < – s ≥ 4 3. –5.1 ≤ x – y > 4 g < 4  4 3 2  s ≥ –1 4 3 2  x ≥ y < 1/5 2/5 3/5 4/ /5 4545

Evaluating Algebraic Expressions 3-6 Solving Inequalities by Adding or Subtracting Lesson Quiz: Part II 5. Tasha is folding letters for a fundraiser. She knows there are at least 300 letters, and she has already folded 125 of them. Write and solve an inequality to show how many more letters she must fold x ≥ 300; x ≥ 175