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