Answer
The $\Delta y$ is of 9
Work Step by Step
$f(x)=3x+2$
Now increase $x$ by 3,
$\implies$ $f(x+3)=3(x+3)+2=3x+11$
$f(x) - f(x+3) = 9$ =$\Delta y$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 1 - Precalculus Review - 1.2 Linear and Quadratic Functions - Preliminary Questions - Page 17: 4
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