ANSWERS A-15 55. (1, 0) (0, 1) x 1 y 5 1 4 24 22 4 22 24 x y 2 2 56. (0, 23) (3, 0) x – y 5 3 2 22 4 22 x y 2 24 57. x 2 2 22 4 6 4 (0, 6) (3, 0) 2x 1 y 5 6 22 24 y 58. x y 2 2 24 22 6 4 (0, 6) (22, 0) 3x 2 y 5 26 59. (0, 3) (6, 0) 4 2 2 4 6 22 22 x 1 2y 5 6 x y 60. (0, 24) 4 2 2 4 22 22 24 2x 2 y 5 4 x y (2, 0) 61. 2 2 24 22 24 2x 5 24y 2 8 (0, 22) (24, 0) x y 62. x y 2 24 22 24 4 4 (21.5, 0) (0, 3) 6x 5 3y 2 9 71. (0, 2) (1, 3) 4 2 2 4 24 22 24 y 5 x 1 2 x y 22 72. (0, 22) (21, 21) 4 2 2 4 24 22 22 24 y 5 2x 2 2 x y 73. (0, 3) (1, 1) 2 4 22 24 y 522x 1 3 x y 4 2 22 24 74. (1, 2) (0, 21) 4 2 2 4 24 22 y 5 3x 2 1 x y 22 24 75. (0, 1) (2, 0) 4 2 2 24 22 22 24 y 52 x 1 1 1 2 x y 4 76. x y 22 24 4 2 24 4 (2, 21) (0, 22) y 5 x 2 2 1 2 77. x y 22 2 22 4 3x 2 2y 1 6 5 0 (22, 0) (0, 3) 78. 22 2 6 8 22 x 24 –6 2 4 y 3x 1 4y 28 5 0 (0, 2) (4, 21) 83. x y 2 (3, 2) 2 4 22 24 4 x 5 3 (3, 22) 22 24 Slope is undefined 84. x y 2 (22, 1) (22, 24) 2 4 24 22 24 4 x 5 22 Slope is undefined 85. x y 2 (22, 3) (2, 3) 2 4 22 24 4 y 5 3 22 24 Slope is 0. 86. x y 2 y 5 24 (2, 24) (24, 24) 2 22 4 4 22 24 Slope is 0. 99. a) s C 80 40 120 160 200 Cost ($) C 5 40 1 0.30s (200, 100) (0, 40) (500, 190) 100 200 300 400 500 Square Feet 100. a) 10 20 30 40 50 60 –300 –200 –100 100 0 200 300 400 500 600 p n p 5 15n 2 300 (50, 450) (60, 600) (30, 150) (20, 0) (0, 2300) Profit ($) Dozens of Chocolates Sold
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