Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 3 - Section 3.4 - Slope and Rate of Change - Practice: 9

Answer

This slope means that every year, there's a 12 billion dollar increase in sales.

Work Step by Step

Slope $= \frac{\delta y}{\delta x}$ Slope $= \frac{240-120}{1990-1980}$ Slope $= \frac{120}{10}=\frac{12}{1}=12$ $y$ is the number of sales. $x$ is the year. This slope means that every year, there's a 12 billion dollar increase in sales.
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