1. Solving One-Step Equations
ALGEBRA 1 LESSON 2-1
pages 77–80  Exercises
1. 8
2. –3
3. 13
4. 40
5. –1
6. 5
7. 1
10. –18
11. 4
12. –7
13. –57
14.
15. 3
16. 2
17. –1.5
g = 41 ; 2 in.
= t – 2.5; 7%
23. –18
24. –320
26. –20
27. –245
29. –9
30. –27
31. –10
32. 2
33. 16
34. –45
35. –72 5 11 1 3 2 3 3 4 1 2 3 4 1 3
2-1

2. Solving One-Step Equations
ALGEBRA 1 LESSON 2-1
36. 6
37. 12
38. –4
39. 14
40. –
41. –15
42. –4
43. 8
44. –20
45. 2
46. –1
47. –13 3 5
48. 16
49. –
50.
51. –1
52. –
53. No; is close to 100
and is close to 60,
so the difference is close to 40.
54. Answers may vary. Sample:
CDs cost $15 each. How
many CDs can you buy
for $120?
56. 18
57. –
58. –9
59. –60
61. –11.4
62. –17.5
63. –
65. –0.89
66. 13 4 5 4 7 1 4 9 11 3 8 1 3 2 7 1 2 5 9 5 18
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3. Solving One-Step Equations
ALGEBRA 1 LESSON 2-1
67. –3
68. –17.1
69. –1
p = 46; 8.8 in.
= e – 1048; 1237 engineers
72. a. 106,000 + i = 4,930,000; 4,824,000
b. v = 1,928,000; 4,820,000
73. 17x = , $6.25
74. Answers may vary. Sample:
A letter only needs to represent
the same value in related
equations. If equations are not
related, the values of the variable
may be different. 3 4
75. Subtr. Prop. of Eq.
76. a. The student forgot the
neg. and used 112 instead
of 11.2.
b. The student could have
estimated by finding the
product of –6 and 11,
which is –66.
77. 44
78. 14
79. 92
80. a. Let = cost of labor,
(166.50) = ; = $55.50
b. $37.00/h
81. 71° 1 4 2 5 1 3
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