Answers for Lesson 6-4, pp. 333-334
Exercises
1. 18; 9
2. 3;-9
3. -6; 30
4.
-3
5.
6. -8; 12
7. 6; 4
8.
9. -5; 4
10. B
11. C
12. A
13.
14.
15.
16.
17.
18.
19. horizontal
20. vertical
21. horizontal
22. vertical
23.
24.
Answers for Lesson 6-4, pp. 333-334
25.
Exercises (cont.)
26.
27. -3x + y = 1
28. 4x - y = 7
29. x - 2y = 6
30. -2x + 3y = 15
31. -3x - 4y = 16
32. -4 x - 5y = 35
33. - 14x + 4y = 1
34. 4x + 10y = 1
35. 3x + y = 0
36. a. Answers may vary. Sample: x = no. of cars;
y = no. of vans or trucks
b. 5x + 6.5y = 800
37. a. Answers may vary. Sample: x = time walking;
y = time running
b. 3x + 8y = 15
38.
39.
40.
41.
Answers for Lesson 6-4, pp. 333-334
Exercises (cont.)
25.
26.
27. -3x + y = 1
28. 4x - y = 7
29. x - 2y = 6
30. -2x + 3y = 15
31. -3x – 4y = 16
32. -4x - 5y = 35
33. -14x + 4y = 1
34. 4x + 10y = 1
35. 3x + y = 0
36. a. Answers may vary. Sample: x = no. of cars;
y = no. of vans or trucks
b. 5x + 6.5y = 800
37. a. Answers may vary. Sample: x = time walking;
y = time running
b. 3x + 8y = 15
38.
40.
39.
41.
Answers for Lesson 6-4, pp. 333-334
Exercises (cont.)
42.
43.
44.
45.
46.
47. a.
b.
3x + 7y = 28
7 oz
48. 4.29x + 3.99y = 30
49. y =
+ 10
50. y =
+3
Answers for Lesson 6-4, pp. 333-334
Exercises (cont.)
51. y =
-3
52. y =
53. y =
-8
54. y =
55. Answers may vary. Sample: slope-intercept form when
comparing the steepness of two lines; standard form when
making quick graphs
56. Answers may vary. Sample: 0x + 0y = 0, no linear equation
exists.
57. - 3x instead of 3x
58. y = 2
59. y = -2
60. x = 1
61. x = -2
Answers for Lesson 6-4, pp. 333-334
Exercises (cont.)
62. a. 200s + 150a = 1200
b.
Answers may vary. Sample:
s = $3.00, a = $4.00;
s = $3.60, a = $3.20;
s = $4.50, a = $2.00
s = $3.00 and
a = $4.00 because they are whole
dollar amounts, and adults pay more.
63. y =
64.
+4
square
65. a.
b.
c. Answers may vary. Sample: The x- and y-intercepts of
2x + 3y = 18 are 3 times those of 2x + 3y = 6.