Can someone please help me with 4, 5, 6, 7, 8

Can Someone Please Help Me With 4 5 6 7 8 class=

Answer :

4)1,-1
5) 2,1
6)2,1
7) 3,10
8)-3,8
4) x=1, y= -1

5) x=2, y=1

6) x=2, y=1

7) x=3,y=10

8) x= -3, y= 8