Answer
$f$ is not a linear function.
Work Step by Step
We set $A$ to refer to "$f$ is a linear function". Now, we have $A$ as true. The negation of $A$ will be false, that is, one can say:
$f$ is not a linear function.
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Appendix A - The Language of Mathematics - Exercises - Page A5: 8
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