Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 3 - Introduction to Graphing - 3.5 Slope - 3.5 Exercise Set: 19

Answer

$\frac{1}{2}$ point per $\$1000$ increase in family income.

Work Step by Step

The graph contains the points $(50, 490)$ and $(90, 510)$. To find the rate of change in the SAT critical reading scores with respect to family income, use the formula $\dfrac{\text{change in y}}{\text{change in x}}$. rate of change = $\dfrac{510-490}{90-50}=\dfrac{20}{40}=\dfrac{1}{2}$ Thus, the rate of change in SAT critical reading scores with respect to family income is $\frac{1}{2}$ point per $\$1000$ increase in family income.
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