1. 3-8 Direct, Inverse, Joint Variation
ESSENTIAL QUESTION-
How do you write an equation with a direct, inverse or joint variation?
How do you solve problems with direct, inverse or joint variation?

2. Direct Variation y = kxn, n>0 k is the constant of variation
As one value incrases, the other value also increases at a constant rate.
Examples:
The relationship between hours worked and wages (money) earned. As you work more hours, the more wages you earn, increasing at a constant rate.
The relationship between braking distance and car speed. As the speed of the car increases, the braking distance also increases at a constant rate

3. Lesson Overview 3-8A

4. Inverse Variation (Inversely proportional)
As one value increases the other decreases.
When you travel to a higher elevation above Earth’s surface, the air temperature decreases.

5. Lesson Overview 3-8B

6. Joint Variation – when one quantity varies directly as the product of two or more other quantities.
y = kxnzn where x and z cannot = 0 and n > 0

7. Lesson Overview 3-8C