Inequality calculation problem 300, binary linear equation 200 to Be sure to have enough quantity. Don't be too difficult or too simple. Thank you

1.2x+9y=81
3x+y=34
2.9x+4y=35
8x+3y=30
3.7x+2y=52
7x+4y=62
4.4x+6y=54
9x+2y=87
5.2x+y=7
2x+5y=19
6.x+2y=21
3x+5y=56
7.5x+7y=52
5x+2y=22
8.5x+5y=65
7x+7y=203
9.8x+4y=56
x+4y=21
10.5x+7y=41
5x+8y=44
11.7x+5y=54
3x+4y=38
12.x+8y=15
4x+y=29
13.3x+6y=24
9x+5y=46
14.9x+2y=62
4x+3y=36
15.9x+4y=46
7x+4y=42
16.9x+7y=135
4x+y=41
17.3x+8y=51
x+6y=27
18.9x+3y=99
4x+7y=95
19.9x+2y=38
3x+6y=18
20.5x+5y=45
7x+9y=69
21.8x+2y=28
7x+8y=62
22.x+6y=14
3x+3y=27
23.7x+4y=67
2x+8y=26
24.5x+4y=52
7x+6y=74
25.7x+y=9
4x+6y=16
26.6x+6y=48
6x+3y=42
27.8x+2y=16
7x+y=11
28.4x+9y=77
8x+6y=94
29.6x+8y=68
7x+6y=66
30.2x+2y=22
7x+2y=47
31.x-y=3
3x-8y=4
x=y+3
32.3x+2y=7
5x-2y=1
33.x=3-5t
3y-2t=x
(33) 40x+31y=6043
45x-y=3555
(34) 47x+50y=8598
45x+y=3780
(35) 45x-30y=-1455
29x-y=725
(36) 11x-43y=-1361
47x+y=799
(37) 33x+59y=3254
94x+y=1034
(38) 89x-74y=-2735
68x+y=1020
(39) 94x+71y=7517
78x+y=3822
(40) 28x-62y=-4934
46x+y=552
(41) 75x+43y=8472
17x-y=1394
(42) 41x-38y=-1180
29x+y=1450
(43) 22x-59y=824
63x+y=4725
(44) 95x-56y=-401
90x+y=1530
(45) 93x-52y=-852
29x+y=464
(46) 93x+12y=8823
54x+y=4914
(47) 21x-63y=84
20x+y=1880
(48) 48x+93y=9756
38x-y=950
(49) 99x-67y=4011
75x-y=5475
(50) 83x+64y=9291
90x-y=3690
6x+8＞3x+8
3x-7≥4x-4
2x-19＜7x+31
2x-3x+1＜6
3x-2(9-x)＞3(7+2x)-(11-6x)
2(3x-1)-3(4x+5)≤x-4(x-7)
2(x-1)-x＞3(x-1)-3x-5
3[y-2(y-7)]≤4y
15-(7+5x)≤2x+(5-3x)
20x-3≤5x+(x-5)
7x-2(x-3)59
4x-106(X+3)
2/3(x+6-9)26
3x50
-4x>3
x+5>-1
4x6
2xo.1
-3x-1
4x>-12
3(2x+5)>2(4x+3)
10-4(x-4)x-5/4
2x+5

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The municipal company plans to buy 500 seedlings of a and B in order to green a section of scenic belt along the river, 50 yuan for each seedling of a and 80 yuan for each seedling of B. relevant statistics show that the survival rates of a and B are 90% and 95% respectively
(1) If the purchase of seedlings shared 28000 yuan, how many seedlings of a and B?
(2) If the purchase price of seedlings does not exceed 34000 yuan, how to purchase seedlings?
(3) If we hope that the survival rate of this batch of seedlings is not less than 92%, and the cost of purchasing seedlings is the lowest, how to purchase seedlings?

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∴a+b+2.5=6,
∴a+b=3.5,①
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∴a2+b2=2.52,②
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1. Truth is both absolute and relative, the unity of absoluteness and relativity
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The absoluteness and relativity of truth contain and permeate each other
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Inequality calculation problem 300, binary linear equation 200 to Be sure to have enough quantity. Don't be too difficult or too simple. Thank you