Answer
Not a function.
Work Step by Step
A relation is a function if for every $x$, there is at most $1$ corresponding $y$ value. Here for $x=1$, there is $y=5$ and $y=12$, thus it is not a function.
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 4 - Section 4.2 - Building Linear Models from Data - 4.2 Assess Your Understanding - Page 287: 1
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