25x+y= 1200
Answer: x=48 y=47.
(2) 18x+23y=2303
74x-y= 1998
Answer: x=27 y=79
(3) 44x+90y=7796
44x+y=3476
Answer: x=79 y=48
⑷76x-66y = 4082
30x-y=2940
Answer: x=98 y=5 1.
(5) 67x+54y=8546
7 1x-y=5680
Answer: x=80 y=59
(6) 42x-95y=- 14 10
2 1x-y= 1575
Answer: x=75 y=48
(7) 47x-40y=853
34x-y=2006
Answer: x=59 y=48
(8) 19x-32y=- 1786
75x+y=4950
Answer: x=66 y=95
(9) 97x+24y=7202
58x-y=2900
Answer: x=50 y=98
( 10) 42x+85y=6362
63x-y= 1638
Answer: x=26 y=62
( 1 1)85x-92y =-25 18
27x-y=486
Answer: x= 18 y=44.
( 12) 79x+40y=24 19
56x-y= 1 176
Answer: x=2 1 y= 19.
( 13) 80x-87y=2 156
22x-y=880
Answer: x=40 y= 12.
( 14) 32x+62y=5 134
57x+y=2850
Answer: x=50 y=57
( 15) 83x-49y=82
59x+y=2 183
Answer: x=37 y=6 1.
( 16) 9 1x+70y=5845
95x-y=4275
Answer: x=45 y=25.
( 17) 29x+44y=528 1
88x-y=3608
Answer: x=4 1 y=93.
( 18) 25x-95y=-4355
40x-y=2000
Answer: x=50 y=59
( 19) 54x+68y=3284
78x+y= 1404
Answer: x= 18 y=34.
(20) 70x+ 13y=3520
52x+y=2 132
Answer: x=4 1 y=50.
(2 1) 48x-54y=-3 186
24x+y= 1080
Answer: x=45 y=99
(22) 36x+77y=76 19
47x-y=799
Answer: x= 17 y=9 1.
(23) 13x-42y=-27 17
3 1x-y= 1333
Answer: x=43 y=78
(24) 28x+28y=3332
52x-y=4628
Answer: x=89 y=30
(25) 62x-98y=-2564
46x-y=2024
Answer: x=44 y=54.
(26) 79x-76y=-4388
26x-y=832
Answer: x=32 y=9 1.
(27) 63x-40y=-82 1
42x-y=546
Answer: x= 13 y=4 1.
(28) 69x-96y=- 1209
42x+y=3822
Answer: x=9 1 y=78.
(29) 85x+67y=7338
1 1x+y=308
Answer: x=28 y=74
(30) 78x+74y= 12928
14x+y= 12 18
Answer: x=87 y=83.
(3 1) 39x+42y=533 1
59x-y=584 1
Answer: x=99 y=35
(32)29x+ 18y = 19 16
58x+y=2320
Answer: x=40 y=42
(33) 40x+3 1y=6043
45x-y=3555
Answer: x=79 y=93
(34) 47x+50y=8598
45x+y=3780
Answer: x=84 y=93
(35) 45x-30y=- 1455
29x-y=725
Answer: x=25 y=86
(36) 1 1x-43y =- 136 1
47x+y=799
Answer: x= 17 y=36.
(37) 33x+59y=3254
94x+y= 1034
Answer: x= 1 1 y=49.
(38) 89x-74y=-2735
68x+y= 1020
Answer: x= 15 y=55.
(39) 94x+7 1y=75 17
78x+y=3822
Answer: x=49 y=4 1.
(40) 28x-62y=-4934
46x+y=552
Answer: x= 12 y=85.
(4 1) 75x+43y=8472
17x-y= 1394
Answer: x=82 y=54.
4 1x-38y =- 1 180
29x+y= 1450
Answer: x=50 y=85
(43) 22x-59y=824
63x+y=4725
Answer: x=75 y= 14.
(44) 95x-56y=-40 1
90x+y= 1530
Answer: x= 17 y=36.
(45) 93x-52y=-852
29x+y=464
Answer: x= 16 y=45.
(46) 93x+ 12y=8823
54x+y=49 14
Answer: x=9 1 y=30.
(47) 2 1x-63y=84
20x+y= 1880
Answer: x=94 y=30
(48) 48x+93y=9756
38x-y=950
Answer: x=25 y=92
(49) 99x-67y=40 1 1
75x-y=5475
Answer: x=73 y=48
(50) 83x+64y=929 1
90x-y=3690
Answer: x=4 1 y=92.
One yuan at a time:
1) 12(2-3X)=4X+4
24-36X=4X+4
-40X=-20
X= 1/2
(2)6-3(X+2/3)=2/3
6-3X-2=2/3
-3X=- 10/3
X= 10/9
(3)2(200- 15X)=70+25X
400-30 times = 70+25 times
-55 times =-330
X=6
(4)3(2X+ 1)= 12
6X+3= 12
6X=9
X=3/2
(5) 1/4X- 1/2=3/4
( 1/4)X=5/4
X=5
(6)7X-5/4 =3/8
7X= 13/8
X= 13/56
(7)2X- 1/6 = 5X+ 1/8
-3X=7/24
X=-7/72
(8)( 1/2)X-7 = 9X-2/6
-( 17/2)X=20/3
X=-20/5 1
(9)( 1/5)X- 1/2(3-2X)= 1
( 1/5)X-3/2+X= 1
(6/5)X=5/2
X=25/ 12
( 10)2X+( 1/3)-5X-( 1/6)= 1
-3X+( 1/6)= 1
-3X=5/6
X=-5/ 18
( 1 1) 1/7(2X+ 14)= 4-2X
(2/7)X+2=4-2X
( 16/7)X=2
X=7/8
( 12)3/ 10(200+X)-2/ 10(300-X)= 300 * 9/25
60+(3/ 10)X-60+( 1/5)X = 108
( 1/2)X= 108
X=2 16
Three yuan once:
( 1)3x-y+z=3
2x+y-3z= 1 1
5x+4z= 14
3x-y+z=3
x+y+z= 12
4x+2z= 15
8x+4z=30
3x= 16，x= 16/3，z =( 15-64/3)/2 =- 19/6
y = 12- 16/3+ 19/6 =(72-32+ 19)/6 = 59/6
(2)8x+2y-2z=24
3x+2y+z=5
5x-3z= 19
3x+2y+z=5
2x-2y+ 10z=2
5x+ 1 1z=7
5x-3z= 19
14z=- 12，z=-6/7，5x = 19+ 18/7 = 15 1/7，x= 15 1/35
y = x+5z- 1 = 15 1/35- 150/35- 1 =-34/35
(3)
z=3x- 1，y=3z-4=9x-3-4=9x-7
2x+63x-49=3，65x=46
(4)
x+y=3 2x-y+2z=2 x-y-z=3
y=3-x，x-3+x-z=3，z=2x-6
2x-3+x+4x- 12=2，7x= 15+2= 17，
(5)
x-2y-3z =- 18 x+3y-2z-8 = 0 x+y+2z-24 = 0
x+y+2z=24
3y+5z=42
x+3y-2z=8
x+y+2z=24
-2y+4z= 16
6y+ 10z=84
-6y+ 12z=48
22z= 132，，z=6，，3y=42-30，y=4
x=24-4- 12=8
Never mind, I copied it!