Chapter 3 Homework Answers
# 15 3.1
1. does; does not
2. II 3. y
4. 3 5. 6 6. -4 9. neg. /neg.
10. neg./ pos.
11. pos./neg.
12. pos./pos.
25. no
27. yes
29. no
31. no
33. 11
35. -7/2
37. -4
39. -5
41. (0,4) (6,0) (-6,8)
43. (0,3) (-5,0) (-15, -6)
45. (-9,6) (-9, 2) (-9,-3)
53. (2,4); I
55. (-5,4); II
57. (3,0) no quadrant
59. either II or IV
61. – 75. see pgs. A-6 – A-7 81. a) (5, 45) b) (6, 50)
#16 3.2
3. a)A, b)C, c)D, d)B
9. 5;5;3
11. 1;3;-1
13. -6;-2;-5
15. 0; (0,-8); 0; (8,0)
17. (0,-8); (12,0)
19. (0,0); (0,0)
47. a) 151.5cm; 159.3cm; 174.9cm b) (20, 151.5); (22, 159.3); (26, 174.9)
c) see book d) 24cm; 24cm
For all graphs see book pgs A-7 – A-8
49. a) $62.50; $100 b) 200 c) (50, 62.50); (100, 100); (200,175) d) see book
#17 3.3
5. 4 7. -1/2
9. answers will vary
13. a)pos. b) neg.
15.a) 0 b) neg.
25. 3/2
27. -3
29. 0
39. 1/4
41. 3/2
43. -3/2
49. 1
51. 4/3; 4/3; parallel
55. 3/5; -5/3; perpendicular
11. a) neg. b) 0
17. 8/27
19. -2/3
23. 5/4
31. undefined
37. 5
45. 0
47. undefined
53. 5/3; 3/5; neither
#18 3.4
1. a) D, b)C, c) B, d) A
3. a) C, b) B, c) A, d) D
9. slope 1/5, y-int. (0, -3/10)
11. y = 4x - 3
17. x = 0
19. y = 3x – 3
21. y = -x + 3
7. slope -1, y-int. (0,9)
13. y = -x – 7 15. y = 3
1
23. y = - x + 2
2
43. y = 2x – 7
selected exercises #25 – 41 see book page A-8, A-9
2
1
4
y =- x-2
y= x+
45. y = -2x – 4
53.
55.
3
3
3
2x + 3y = -6
x - 3y = -4
59. y = 4x – 5
#19
57. y = -2x – 3
TBD
#20 3.5
3. £ 4. ³ 5. false, it lies on the boundary line, which is not included in the
solution set 6. true
7. false; (0,0) lies on the boundary line and a test point
must be off of the line
8. false; use a solid line
9. true
10. true
For all graphs see book p. A-9
21. Use a dashed line for <,>. Use a solid line for £,³ ,
22. A test point must not be on the line