9. (3,−1)
11. None of them
13. (10,−9)
15. (2, 1)
17. (2, 2)
19. Inconsistent
21. (73, 143)
23. {(x, 12−3x)}
25. Independent
27. Independent
29. Dependent
31. Independent
33. Inconsistent
35. Inconsistent
37. Independent
39. {(79, 239)}
41. {(3, 4)}
43. ∅
45. {(−3, 5)}
47. {(x, 12 (x−5))}
49. {(3, 2)}
51. {(−3, 3)}
53. {(0,−5)}
55. ∅
57. {(x, 2−23x)}
59. {(4, 1)}
61. {(−4, 2)}
63. {(2, 1)}
65. {(3, 1)}
67. {(196, 54)}
69. {(4, 2)}
71. {(4, 1)}
73. ∅
75. (x, 23 (x−3))
77. {(−15, 1)}
79. {(32, 12)}
81. {(5, 5)}
83. ∅
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