9. 43, rising
11. 0, horizontal
13. −2.2, falling
15. 4, rising
17. ℓ3
19. ℓ4
21. 1
23. 2
25. y=3x+5
27. y=12x+4
29. y=−32x+4
31. y=−4
33. y=−x+1
35. y=3
37. y=23x+13
39. y=−72x+2
41. x=5
43. y=0
45. y=14
47. y=−23x−4
49. y=43x+4
51. y=7
53. y=−5
55. m=3 x intercept: 2/3, y intercept −2
57. m=−12; y-intercept =2;x-intercept =4
59. m=32; y-intercept =3;x-intercept =−2
61. m is undefined; no y-intercept; x-intercept =5
63. m is undefined; y-intercept =y-axis; x-intercept =0
67. x3+y2=1; x-intercept =3; y-intercept =2
69. x-intercept: 6, y-intercept −4
71. x-intercept: −2, y-intercept 5
73. y=x+2; because the coordinates of the point (−1, 1) satisfy this equation, (−1, 1) also lies on this line.
75. y=−34x
77. y=(3/2)x−4
79. Parallel
81. Perpendicular
83. Neither
85. Perpendicular
87. Parallel
89. y=3x−9
91. y=2x+4
93. y=−x−7
95. y=−(1/3)x−5/3
97. y=6x+4
99. y=−16x+4
101. y=−x+2
103. y=−3x−2
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