1. Direct variation

2. Pass out flat foldable

3. We will be looking to see if there is a direct relationship in different sets of data. If the constant of proportionality (now called constant of variation) is the same for all data given, the data is related through a direct variation.

4. The graph of a direct variation always passes through the origin; therefore, represents a proportional relationship.

5. Direct variation can be written
y = kx

6. Constant of proportionality constant of variation same thing
Can be written
𝑦 𝑥 = k

7. Watch this video on direct variation
ntSrc=13192/13192.xml

8. Determine whether the data set showS direct variation
Determine whether the data set showS direct variation. If so, write an equation that describes the relationship. Use 𝑦 𝑥 = k

9. Determine whether the data set showS direct variation
Determine whether the data set showS direct variation. If so, write an equation that describes the relationship. Use 𝑦 𝑥 = k

10. Determine whether the data set showS direct variation
Determine whether the data set showS direct variation. If so, write an equation that describes the relationship. Use 𝑦 𝑥 = k YOU TRY THIS ONE 

11. Determine whether the data set show direct variation
Determine whether the data set show direct variation. If so, write an equation that describes the relationship. Use 𝑦 𝑥 = k YOU TRY THIS ONE 

12. 1—Make table labeled x y
2—Find the constant of variation
3—Write a direct variation equation
4—Use equation to find how many pounds in 152 ounces.

13. 1—Make table labeled x y
2—Find the constant of variation
3—Write a direct variation equation
4—Use equation to find how many pounds in 152 ounces.