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6–7 Proportions and EquationsEXAMPLE Write an Equation for a FunctionMAIN IDEA• Write an equation todescribe a proportionalsituation.Write an equationto represent thefunction displayedin the table.Input, x 1 2 3 4 5Output, y 9 18 27 36 45Examine how the value of each input and output changes. Eachoutput y is equal tothe input x. So, the equationthat represents the function is .Check Your ProgressWrite an equationto represent thefunction displayedin the table.Input, x 1 2 3 4 5Output, y 11 22 33 44 55Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.EXAMPLESBOOKS Javier sells handmade notebooks. He charges$25 for each book.Make a table to show the relationship between thenumber of books sold b and the total amount Javierearns t.The total earned (output) is equal tonumber of books sold (input).BooksSold, bMultiply by 251 1 × 252 2 × 253 3 × 25TotalEarned ($), tthe4 4 × 25Math Connects, Course 1 161