Answer
The function is linear because the rate of change (i.e., slope) is constant.
Work Step by Step
As $x$ increases by $1$, $y$ decreases by $15$. The rate of change is constant. So, the function is linear.
Big Ideas Math - Algebra 1, A Common Core Curriculum
by Larson, Ron; Boswell, Laurie
Published by
Big Ideas Learning LLC
ISBN 10:
978-1-60840-838-2
ISBN 13:
978-1-60840-838-2
Chapter 3 - Graphing Linear Functions - 3.2 - Linear Functions - Exercises - Page 117: 14
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