rewrite these formulas: solve for u in terms of the other variables.

1. uc = v

2. y = -6u

3. y/u = a

4. 2 = u/v

5. a/u = v

6. b/u = c

7. u/z = y

8. -3u = z

9. 3u = v

10. uy = a

11. v = y/u

12. uy = -10