Exercises 5.3, page 157

  1. 1. x =  − 3 ,  y =  − 3

  2. 3. x = 1613 ,  y =  − 213

  3. 5. x = 1 ,  y =  − 2

  4. 7. V = 7 ,  p = 3

  5. 9. x =  − 1 ,  y =  − 4

  6. 11. x = 12 ,  y = 2

  7. 13. x = 1 ,  y = 12

  8. 15. x = 3 ,  y = 1

  9. 17. x =  − 1 ,  y =  − 2

  10. 19. t =  − 13 ,  y = 2

  11. 21. Inconsistent

  12. 23. x =  − 145 ,  y =  − 165

  13. 25. x = 12 ,  y =  − 4

  14. 27. t =  − 23 ,  y = 0

  15. 29. x = 35 ,  y = 15

  16. 31. C =  − 1 ,  V =  − 2

  17. 33. A =  − 1 ,  B = 3

  18. 35. a = 13 ,  b =  − 7

  19. 37. x = 2.38 ,  y = 0.45

  20. 39. s = 3.9 ,  t = 3.2

  21. 41. x = 173 ,  y = 16

  22. 43. f(x) = 2x − 3

  23. 45. x = 1 ,  y = 2

  24. 47. V1 = 9.0 V ,  V2 = 6.0 V

  25. 49. x = 6250 L ,  y = 3750 L

  26. 51. 62

  27. 53. Wr = 8120 N ,  Wf = 9580 N

  28. 55. t1 = 32 s ,  t2 = 20 s

  29. 57. 34 at $900/month, 20 at $1250/month

  30. 59. A = 150,000 ,  B = 148,000

  31. 61. 7.00 kW, 9.39 kW

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