1. 9-4 Variation Direct Variation Inverse Variation Joint Variation

2. Vocabulary Direct Variation Constant of Variation As one item increases, so does another … Studying and good grades Exercising and increased strength Practicing guitar and becoming a better musician

3. #1 Find an equation of variation where y varies directly as x.

4. #2 Find an equation of variation where y varies directly as x.

5. Vocabulary Inverse Variation

6. #3 Find an equation of variation where y varies inversely as x.

7. #4 Find an equation of variation where y varies inversely as x.

8. Vocabulary Joint Variation

9. #7 Find an equation of variation where w varies jointly as x, y, and z.

10. #8 Find an equation of variation where Q varies jointly as R and S.

11. Vocabulary Combined Variation

12. #9 Find an equation of combined variation where P varies directly as q and inversely as r.

13. #10 Solve the problem using combined variation. Find an equation of combined variation where A varies directly as b and inversely as c. One set of values is A = 4, b = 12, and c = 9. Find A when b = 7 and c = 3.

14. #10 Solve the problem using combined variation.