2x-y= 1
2.(20 12? Qiandongnan Prefecture) solves equation 2x+3y+z=6.
x-y+2z=- 1
x+2y-z=5
3..(20 12? Nanjing) solve the equation x+3y=- 1.
3x-2y=8
4.(20 12? Huzhou) solve equation 2x+y=8.
x-y= 1
6..(20 12? Guangzhou) solve the equation x-y=8.
3x+y= 12
7.(20 12? Guangdong) Solve the equation: x-y=4 ①.
3x+y= 16 ②
8.(20 1 1? Yueyang) Solve the equation: x+y=3 ①.
5x-3(x+y)= 1 ②
9..(20 1 1? Yongzhou) Solve the equation: 4x-3y= 1 1.
2x+y= 13
10..(20 1 1? Yichang) solve the equation x-y= 12.
x+y=2
1 1..(20 1 1? Nanchang) solve the equation: x-2y=- 1.
x-y=2-2y。
12.(20 1 1? Meishan) Solve the equation: 2x+y= 1①.
x-y=2②
13.(20 1 1? Huaihua) Solve the equation: x+3y=8.
5x-3y=4
14.。 (20 1 1? Guilin) solving binary linear equations: x=3y-53.
8-2 times
15.(20 1 1? Baoshan) solves the equation x+2y=9.
-2y=5
16..(20 10? Nanjing) Solving equation: 2x+y=4
x+2y=5
17..(20 10? Lishui) Solution equation: 2x-y=3( 1)
x+y=7(2)
18..(20 10? Huaihua) Solve the equation: x-y=5①
3x-y=- 1②
19..(20 10? Guangzhou) solve the equation: x+2y= 13.
x-2y= 1 1
20.(20 10? Beihai) Solve equation 2x+y=5.
x-y= 1