Help please just these questions whoever answers correctly I will mark your answer brainliest again don't forget the explanation Please help

1. y= x-2
y=4

2. y= x+8
y= -2

3. y=x-5
y=6

4. y= x+6
y= -4

5. y= x-9
y= 3

6. y= x+4
y= -x

7. y= x-5
y= 2x

8. y= x+ 12
y= 1/2x

9. y= x-8
y= 3x

10. y= -x-2
2x-3y= -9

11. y= 2x-1
y= x+1

12. y= 2x+2
4x-y= -6

13. 2x+2y=3 1/2
x-4y=-1

14. y=x-4
4x+y=26

15. x-2y=-25
3x-y=0