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Let d represent the number of hot dogs, and let s represent the number of sausages.

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Let d represent the number of hot dogs, and let s represent the number of sausages.

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  1. Leyla is selling hot dogs and spicy sausages at the fair. She has only 40 buns, so she can sell no more than a total of 40 hot dogs and spicy sausages. Each hot dog sells for $2, and each sausage sells for $2.50. Leyla needs at least $90 in sales to meet her goal. Write and graph a system of inequalities that models this situation.

  2. Let d represent the number of hot dogs, and let s represent the number of sausages. The total number of buns Leyla has can be modeled by the inequality d + s ≤ 40. The amount of money that Leyla needs to meet her goal can be modeled by 2d + 2.5s ≥ 90. d 0 s 0 The system of inequalities is . d + s ≤ 40 2d + 2.5s ≥ 90

  3. Graph the solid boundary line d + s = 40, and shade below it. Graph the solid boundary line 2d + 2.5s ≥ 90, and shade above it. The overlapping region is the solution region.

  4. Check Test the point (5, 32) in both inequalities. This point represents selling 5 hot dogs and 32 sausages. 2d + 2.5s ≥ 90 d + s ≤ 40 2(5) + 2.5(32) ≥ 90 5 + 32 ≤ 40 37 ≤ 40   90 ≥ 90

  5. y< – 3 y ≥–x + 2 For y < – 3, graph the dashed boundary line y =– 3, and shade below it. Graphing Systems of Inequalities Graph the system of inequalities. For y ≥ –x + 2, graph the solid boundary line y = –x + 2, and shade above it. The overlapping region is the solution region.

  6. Helpful Hint If you are unsure which direction to shade, use the origin as a test point.

  7. Systems of inequalities may contain more than two inequalities.

  8. Graph the system of inequalities, and classify the figure created by the solution region. x ≥ –2 x ≤ 3 y ≥ –x + 1 y ≤ 4

  9. Graph the solid boundary line x = –2 and shade to the right of it. Graph the solid boundary line x = 3, and shade to the left of it. Graph the solid boundary line y = –x + 1, and shade above it. Graph the solid boundary line y = 4, and shade below it. The overlapping region is the solution region.

  10. Graph the system of inequalities, and classify the figure created by the solution region. x ≤ 6 y ≤ x + 1 y ≥ –2x + 4

  11. Graph the solid boundary line x = 6 and shade to the left of it. Graph the solid boundary line, y ≤x + 1 and shade below it. Graph the solid boundary line y ≥ –2x + 4, and shade below it. The overlapping region is the solution region. The solution is a triangle.

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