Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 2 - Section 2.5 - Linear Functions and Models - 2.5 Exercises - Page 196: 30

Answer

k(x) = $-\frac{4}{5}$x -2

Work Step by Step

1. Remember we are writing the function in the form f(x) = ax+b. 2. Since a = rate of change and rate of change in this case = $-\frac{4}{5}$, we have k(x) = $-\frac{4}{5}$x+b. 3. Since the initial value is the value when x = 0 (the y-intercept), which = b, we know that b = -2 4. We now have k(x) = $-\frac{4}{5}$x -2
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