College Algebra 9th txtbk

SA-4
Student Answer Appendix
33. The set of all points that are two units from the point (0, 2).
x 2 (y 2) 2 4
35. The set of all points that are four units from the point (1, 1).
(x 1) 2 (y 1) 2 16
43. Center: (0, 2); radius: 3 45. Center: (4, 2); radius: 17 47. Center: (3, 0); radius: 5 49. Center: (3, 2); radius: 7
y
y
y
y
5
5
10
10
x
x
x
5
5
3
10
10
10
10
5
5
10
10
51. Center: (4, 3); 53. y 23 x 2 55. y 1 22 (x 3) 2
radius: 117
3.1
3.1
y
x
4.7
4.7
4.7
4.7
5
3.1
3.1
5
x
73. (A) A (0, 0), B (0, 13.5), C (0, 27), D (60, 27), E (78, 27), F (78, 13.5), G (78, 0) (B) 62 feet, 79 feet
77. (A) (x 12) 2 ( y 5) 2 26 2 ; center: (12, 5); radius: 26
y
(B) 13.5 miles
(12, 5) 25
Town B
(36, 15)
Town A
50 25 25
x
25
Exercises 2-3
19. Slope 3 5
21. Slope 3 4
23. Slope 2
25.
y
y
y
Slope 4 5
y
10
5
5
10
10
x
5 5
x
5
5
x
10
10
x
10
5
5
10
27. Slope 2
29. Slope not defined
31.
y
y
Slope 0
y
10
5
5
10
10
x
5 5
x
5 5
x
5
5
41. y 3 47. y 2 2 x 23 2
67.
69. (slope AB )(slope BC ) ( 3 5 x 2
4)( 4 3) 1
slope AB 3 4 slope DC