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

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Presentation transcript:

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

2-7A Proportions Algebra 1

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

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.

Example 1 Solve using the multiplication property.

Example 2 Solve

Ex. 3 Solve proportion.

2-7B Proportions Algebra 1

Example 1 Solve 3 = x + 2 7 x

Example 2- Solve proportion. #3 pg140

Ex. 3 Solve proportion.

Example 4 & 5 Use cross products to determine whether each pair of ratios forms a proportion. 4.) 4 , 12 5.) 3 , 21 6 16 2 14

Assignment