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• Количество слайдов: 25 Lesson 6 -6: Am I a Solution? Goal: Find solutions to inequalities of two variables Inequality Symbols • > • < Example 1 Is the following a solution? Example 2 Is the following a solution? Give an example of an ordered pair that would be a solution. Example 3 Is the following a solution? Practice 1 Is the following a solution? (1, 2) (5, -4) (-6, 7) Practice 2 Is the following a solution? (2, 2) (-5, 3) (-9, 0) Example 4 Determine which is a solution. y Example 4 Continued (x, y) y Example 5 Determine which is a solution. 3 x + 2 y < 12 {(1, 6), (3, 0), (2, 2), (4, 3)} Example 5 Continued (x, y) 3 x + 2 y < 12 Solution Practice 3 Determine which is a solution. y < 2 x {(2, 6), (0, -1), (3, 5), (-1, -2)} Practice 3 Continued (x, y) y < 2 x Solution Practice 4 Determine which is a solution. 2 x – 3 y > 6 {(3, 2), (-2, -4), (6, 2), (5, 1)} Practice 4 Continued (x, y) 2 x – 3 y > 6 Solution Example 6 Sally found a used bookstore that sells pre-owned DVDs and CDs. DVDs cost \$9 each and CDs cost \$7 each. Sally can spend no more than \$35. Write an inequality. Example 6 Continued. Does she have enough money to buy 2 DVDs and 3 CDs? Example 7 Camille has no more than \$20. 00 to spend each week for lunch and bus fare. lunch costs \$3. 00 each day and bus fare is \$0. 75 each ride. Write an inequality. Example 7 Continued. Can Camille buy lunch 5 times and ride the bus 8 times in one week? Example 8 Tickets for the fall dance are \$5 person and \$8 for couples. In order to cover expenses, at least \$1200 worth of tickets must be sold. Write an inequality. Example 8 Continued. If 100 single tickets and 125 couple tickets are sold, will the committee cover its expense? Practice 5 Coach Riley wants to take her softball team out for pizza after the game. A large pizza costs \$12 each and a pitcher of soft drink is \$3 each. She doesn’t want to spend more than \$60. Practice 5 Continued Write an inequality. Will the coach be able to buy 3 large pizzas and 8 pitcher of soft drink? Practice 6 Rita wants to spend at most \$230 on a new clothes. The skirts she wants to buy are \$35 each and the blouses are \$25 each. Practice 6 Continued Write an inequality. Can Rita buy 4 skirts and 4 shirts? 