Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter P - Section P.8 - Modeling with Equations - Exercise Set - Page 122: 1

Answer

The number of years watching TV: $9.$ The number of years sleeping: $28.$

Work Step by Step

The number of years watching TV: $ x $ The number of years sleeping: $ x+19$ Total = $ x+(x+19)=2x+19.$ We are given that the total is 37. $ 2x+19=37 \qquad $ ... subtract $19$ $2x=37-19$ $ 2x=18 \qquad $ ... divide with 2 $ x=9$ $(x+19=9+19=28)$ The number of years watching TV: $9.$ The number of years sleeping: $28.$
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