Exercises 5.4, Page 163

  1. 1. 86

  2. 3. x =  − 13 ,  y =  − 27

  3. 5.  − 4

  4. 7. 29

  5. 9. 108

  6. 11. 9300

  7. 13. 1.083

  8. 15.  − 256

  9. 17.  − a2 + a + 2

  10. 19. x = 3 ,  y = 1

  11. 21. x =  − 1 ,  y =  − 2

  12. 23. t =  − 13 ,  y = 2

  13. 25. Inconsistent

  14. 27. x =  − 145 ,  y =  − 165

  15. 29. x = 2 ,  y = 0.4

  16. 31. s = 3.9 ,  t = 3.2

  17. 33. x =  − 11.2 ,  y =  − 9.26

  18. 35. x =  − 1.0 ,  y =  − 2.0

  19. 37. 0

  20. 39. 0

  21. 41. F1 = 15 lb ,  F2 = 6.0 lb

  22. 43. x = 18.4 gal ,  y = 17.6 gal

  23. 45. 160 3-bedroom homes, 80 4-bedroom homes

  24. 47. 210 phones, 110 detectors

  25. 49. L = 1.30 m ,  W = 0.802 m

  26. 51. $2000,6%

  27. 53. 2.5 h, 2.1 h

  28. 55. d = 835 ft ,  h = 327 ft

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