1. Variation

2. Direct Variation if there is some nonzero constant k such that k is called the constant of variation

3. Direct Variation Examples 1)

4. Suppose y varies directly as x and y = 28 when x = 5. Find the constant of variation: Write an equation of the form

5. Use the equation to find the value of y when x = 3. If you are not asked to find the constant of variation, you can use a proportion. Proportion Solve for y

6. Increases.

7. Inverse Variation As one value increases the other value decreases and vice versa.

9. Inverse Variation Proportion

11. How do I determine whether it is Direct or Indirect Variation? How do I determine whether it is Direct or Indirect Variation?

12. Joint Variation One quantity varies directly as the product of two or more other quantities.

13. If y varies jointly as x and the cube of z and y = 16 when x = 4 and z =2, find y when x = - 8 and z = -3.

14. To sum up….. Direct, Inverse, Joint Variation