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3-5 Write Ratios & Proportions Objective: Students will create and solve equations in one variable. Standards: A.REI.3, A.CED.1, A.REI.1

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Vocabulary Ratio: Uses division to compare two quantities. You can write the ratio of two quantities a and b, where b is not equal to zero, in three ways: a to b a : b a b Each ratio is read “the ratio of a to b” Ratios should be written in simplest (reduced) form.

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Vocabulary Proportion: An equation that states that two ratios are equivalent. a = cwhere b ≠ 0, d ≠ 0 b d

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Example 1 At a carwash fund raiser, 18 ninth grade students and 14 tenth grade students worked the first shift. Find the ratio of ninth graders to tenth graders. Find the ratio of ninth graders to all students. ninth graders tenth graders = = 9797 ninth graders all students = = =

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Example 2 12 = 3 h 17 Solve the proportion: 12 = 3 h 17 Cross Multiply. Divide both sides by 3. h = 68 3h =

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Example 3 10 = 4x Solve the proportion: 10 = 4x Cross Multiply. Divide both sides by 112. x = 5 112x =

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Example 4 A backpacker in the Sierras hikes 5.5 miles in 2 hours. If the hiking rate remains the same, how far will the backpacker hike in 7 hours? Write and solve a proportion to find the answer. mi hr = x7x7 mi hr = 5.5 = x 2 7 Cross Multiply Divide both sides by 2. 2x = 38.5 x = or 19 ¼ miles 2 2

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Homework Section 3-5 Pg. 165 – , , 32-38even, 45,50,51, Solve and Prove: even

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