1. Ch. 2 Vocabulary
12.)Proportion 13.) Cross products (of proportion)

2. 2-7A Proportions
Algebra 1

3. Proportion An equation stating that two ratios are equal.
For example, 3 = 6
*What would be another ratio proportional to 3/5 and/or 6/10?

4. Cross Product Property of Proportions
In a proportion, the product of the extremes is equal to the product of the means.
If , then ad = bc.

5. Example 1
Solve using the multiplication property.

6. Example 2
Solve

7. Ex. 3 Solve proportion.

8. 2-7B Proportions
Algebra 1

9. Example 1
Solve 3 = x + 2 x

10. Example 2- Solve proportion.
#3 pg140

11. Ex. 3 Solve proportion.

12. Example 4 & 5
Use cross products to determine whether each pair of ratios forms a proportion.
4.) 4 , ) 3 , 21

13. Assignment