Solve for y in terms of x:?

1. y2=x2-1
2. x2=y2-1
3. x2=y
4. x2+y2=4
5. y=x2-2x
6. 2x2+y=1
7. x2=y+4
8. x3+y=5
9. x4+5=y
10. y=^x+3
11. -x2+y=3
pls with solution....
7 answers 7