1. 61.
3x + 1 = 5x + 4
1.
2.
3.
4.
62.
-2x – 3 = 3 (x – 2)
a
a+2
1.
2.
3.
4. 63.
8
30
6
1. 64
2. 84
3. 104
4. 124
64.
x
1. 9
2. 10
3. 11
4. 12
5
x
35

2. 65.
12
36
1.
2.
3.
4.
4
5
6
7
66. 3x = 9 – 2y
x+y=3
1.
2.
3.
4.
(0, -1)
(1, 2)
(3, 0)
(0, -3)
67.
1.
2.
3.
4.
14
12
18, 24
24, 36
30, 52
34, 42
68. x + 2y = 7
2x – y = 4
1.
2.
3.
4.
69.
7.5
x = 3,
x = -3,
x = 5,
x = -5,
1. 2, 5.5
y=2
y = -2
y=1
y = -1
2.5

3. 2. 3, 4.5
3. 4, 3.5
4. 5, 2.5
70.
1.
2.
3.
4.
71.
1.
2.
3.
4.
23
18, 24, 23, 26, 25, 22, 2
21
22
23
24
72. 12.5, 13, 11.5, 10, 9.5
1. 10.2
2. 11.3
3. 12.1
4. 13.2
73.
1.
2.
3.
4.
2, 2, 2, 3, 4, 5, 6, 7
2, 3, 4, 4, 4, 5, 5, 5, 6
2, 2, 3, 5, 6, 7, 8
3, 4, 5, 6, 6, 7, 7, 7
74. 6y + 9 < -8 + 7y
1. y< 17
2. y< 18
3. y> 17
4. y> 18
75.
y
a

4. (
12
24
28
64
1
1.
2.
3.
4.
76. 25 %
1. 300
2. 320
3. 340
4. 360
77.
1.
2.
3.
4.
78.
1.
2.
3.
4.
1,280
1
12
24
36
44
1
k

5. 79.
2
1.
2.
3.
4.
80.
10
2
3
1. 10
2. 15
3. 20
4. 30
81. 11 + 12 + 13 + … + 20 = ?
1. 55
2. 155
3. 210
4. 310
82.
40
1. 400
2. 680
3. 780

6. 4. 800
83.
10
20
8
2,200
10 %
1.22
2.23
3.24
4.25
84.
1.
2.
3.
4.
1,800
1,900
2,000
2,100
85.
12
6
1. 1
2. 2
3. 3
4. 4
86.
40 %
1.
2.
3.
4.
87.
700
600
10 %
20 %
30 %
40 %
4
14

7. 1.
2.
3.
4.
14
16
18
20
88.
1
4
2
4
6
120
10
1. 1
2. 1
3. 1
4. 1
80
300
600
800
89.
500
15
2
1. 30
2. 60
3. 62
4.120
90.
1
100
0
1. 9
2. 10
3. 11
4. 12

1(
3(

...........91) 4x + 3 = 8
............... 92)
8 + 3d < 25
............. 93)
............... 94)
y2 = 36
9(x – 1) ≠ 12

8. ............. 95)
............... 96)
y2- 2 ≤ 24
............. 97)
............... 98)
5x + 1 ≥ x - 7
-2x + 3 > 15
x - 2 = 14
............. 99)
3 – x = -(x – 3)
............. 100)
x ÷ 9 < 13