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Answer:
1. x+y= -1
2. y= -x - 1
3. x+y = 8
4. y= -x + 8
5. 2x+y = 3
6. y= -2x + 3
7. 2x+2y= -2
8. 2y= -2x-2
9. x-y = -1
10. y= x+1