# 7-1 - 7-1 7-1Ratio Ratioand andProportion Proportion Warm...

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Holt Geometry 7-1 Ratio and Proportion 7-1 Ratio and Proportion Holt Geometry Warm Up Warm Up Lesson Presentation Lesson Presentation Lesson Quiz Lesson Quiz

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Holt Geometry 7-1 Ratio and Proportion Warm Up Find the slope of the line through each pair of points. 1. (1, 5) and (3, 9) 2. (–6, 4) and (6, –2) Solve each equation. 3. 4 x + 5 x + 6 x = 45 4. ( x – 5) 2 = 81 5. Write in simplest form. 2 x = 3 x = 14 or x = –4
Holt Geometry 7-1 Ratio and Proportion Write and simplify ratios. Use proportions to solve problems. Objectives

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Holt Geometry 7-1 Ratio and Proportion ratio proportion extremes means cross products Vocabulary
Holt Geometry 7-1 Ratio and Proportion The Lord of the Rings movies transport viewers to the fantasy world of Middle Earth. Many scenes feature vast fortresses, sprawling cities, and bottomless mines. To film these images, the moviemakers used ratios to help them build highly detailed miniature models.

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Holt Geometry 7-1 Ratio and Proportion A ratio compares two numbers by division. The ratio of two numbers a and b can be written as a to b , a : b , or , where b ≠ 0. For example, the ratios 1 to 2, 1:2, and all represent the same comparison.
Holt Geometry 7-1 Ratio and Proportion In a ratio, the denominator of the fraction cannot be zero because division by zero is undefined. Remember!

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Holt Geometry 7-1 Ratio and Proportion Example 1: Writing Ratios Write a ratio expressing the slope of l. Substitute the given values. Simplify.
Holt Geometry 7-1 Ratio and Proportion Check It Out! Example 1 Given that two points on m are C(–2, 3) and D (6, 5), write a ratio expressing the slope of m . Substitute the given values. Simplify.

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Holt Geometry 7-1 Ratio and Proportion A ratio can involve more than two numbers. For the rectangle, the ratio of the side lengths may be written as 3:7:3:7.
Holt Geometry 7-1

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