No Real Solution. Pg 481 #72, 74, 75. 72. a) C = 2.16x + 5000; R = 3.49x b) 3759 items. 74. Sales greater than $500,000.
Pg 481 #14, 15, 22, 24, 25, 54, 55 14. (–3, 2)
1 2
15. ,3
22. No Solution
3. (5, 4)
25. No Real Solution
54. (3, 4) (5, 0)
55. No Real Solution
Pg 481 #72, 74, 75 a) C = 2.16x + 5000; R = 3.49x b) 3759 items
PG 507 #69, 70, 72
a)
x y 20000 0.065x 0.085 y 1600
b) More invested @ 6.5% means less invested @ 8.5% and less interest overall c) $5000
5 3 70. 2 2 x 3 x 1
3 2 69. 2x 1 x 1 72.
1 2 2 x x 3 x 3
76.
2 1 2 x x 1 x 12
74. Sales greater than $500,000 75.
4. (13, 0), (5, 12)
9. (0, 0), (4, –4)
24. (4, 10) (–2, –2)
72.
Pg 570 #3, 4, 9
PG 570 #5, 6, 11, 12, 17, 18, 38, 51 5. (0, 0), (2, 8), (–2, 8)
6. (5, 2), (2, –1)
11. (–1, 2) (0.67, 2.56) Pg 492 #23, 24, 27, 49, 74, 75, 77 23. Inconsistent 27. (5, -2)
24. All points on 4x + y = 4
17. 4762 units 18. More than $500,000 in sales
49. (6, 5) 38. $18000
5C 3S 8.50 74. a) 6C 4S 10.50 b) Explanations will vary; C = 1.25, S = 0.75 75. 9 oranges, and 7 grapefruit 77. 185 movies, 125 video games
Pg 506 #20, 23, 27, 88, 89, 90
1 2
12. (1.41, –0.66) (–1.41, 10.66)
3 2
3 1 2 2
20. , ,1
23. 1, ,
27. (1, –1, 2)
88. y x2 2x 3
89. y x2 6x 8
90. y 2x2 5x
51.
3 4 x2 x4
