Practice and Applications

  1. 9.  − 17

  2. 11.  − 1485

  3. 13.  − 4

  4. 15. 27

  5. 17. m =  − 2 ,  b = 4

  6. 19. m = 4 ,  b =  − 52

    A line falls through (0, 4) with a rise of negative 2 and run of 1.
    A line rises through (0, negative 5 over 2) with a rise of 4 and run of 1.

  7. 21. x = 2.0 ,  y = 0.0

  8. 23. A = 2.2 ,  B = 2.7

  9. 25. x = 1.5 ,  y =  − 1.9

  10. 27. M = 1.5 ,  N = 0.4

  11. 29. x = 1 ,  y = 2

  12. 31. x = 12 ,  y =  − 2

  13. 33. i = 2 ,  v =  − 13

  14. 35. x =  − 619 ,  y = 3619

  15. 37. x = 4339 ,  y = 713

  16. 39. x = 1 ,  y = 2

  17. 41. x = 12 ,  y =  − 2

  18. 43. i = 2 ,  v =  − 13

  19. 45. x =  − 619 ,  y = 3619

  20. 47. x = 1.10 ,  y = 0.54

  21. 49. Best choices: 41, 42

  22. 51. Best choices: 47, 48

  23. 53.  − 115

  24. 55. 230.08

  25. 57. x = 2 ,  y =  − 1 ,  z = 1

  26. 59. r = 3 ,  s =  − 1 ,  t = 32

  27. 61. x =  − 0.17 ,  y = 0.16 ,  z = 2.4

  28. 63. x =  − 3 ,  y = 4 ,  z =  − 1.5

  29. 65. x = 2 ,  y =  − 1 ,  z = 1

  30. 67. r = 3 ,  s =  − 1 ,  t = 32

  31. 69. x =  − 0.17 ,  y = 0.16 ,  z = 2.4

  32. 71. 4

  33. 73.  − 157

  34. 75. y =  − 0.007x + 54.570 ,  30 mpg

  35. 77.  − 6

  36. 79.  − 43

  37. 81. F1 = 230 lb ,  F2 = 24 lb ,  F3 = 200 lb

  38. 83. p1 = 42% ,  p2 = 58%

  39. 85. $40,000, $4000

  40. 87. 28 tons of 6% copper, 14 tons of 2.4% copper

  41. 89. a = 440 m  ⋅  °  C ,  b = 9.6 ° C

  42. 91. 17.5 tons of 18.0 gal/ton, 24.5 tons of 30.0 gal/ton

  43. 93. 34 at $900/month, 20 at $1250/month

  44. 95. 22,800 km/h, 1400 km/h

  45. 97. R1 = 0.50 Ω  ,  R2 = 1.5 Ω 

  46. 99. L = 10 lb ,  w = 40 lb

  47. 101. A = 75 °  ,  B = 65 °  ,  C = 40 ° 

  48. 103. 68 MB, 24 MB, 48 MB

  49. 105. 4.3 N, 1.7 N

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