Write a proportion that compares hours of work to pay.

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Presentation transcript:

Write a proportion that compares hours of work to pay. Solving Proportions LESSON 7-4 Additional Examples Janet earned $31.50 for 5 hours of work. How much does she earn for 7 hours of work at the same rate of pay? Write a proportion that compares hours of work to pay. Let p = the amount of pay. Write a proportion. hours pay($) 5 31.50 7 p = 5 • p = 31.50 • 7 Write the cross products. 5p = 220.5 Multiply. = Divide each side by 5. 5p 5 220.5 p = 44.1 Simplify. Janet will earn $44.10 for 7 hours of work.

= Write the ratio as a fraction in simplest form. Solving Proportions LESSON 7-4 Additional Examples Solve = . x 27 7 21 = Write the ratio as a fraction in simplest form. 7 21 1 3 = x 27 1 3 3x = 27 Since 3 × 9 = 27, x = 9.

= Start with the proportion. Solving Proportions LESSON 7-4 Additional Examples Solve = . 14 26 21 n = Start with the proportion. 14 26 21 n 14 • n = 26 • 21 Write the cross products. 14n = 546 Multiply. = Divide each side by 14. 14n 14 546 n = 39 Simplify.