Answer
Some functions have multiple outputs for a single input.
Example: $f(x)=\sqrt x$
For $x=1$, we have $y=-1$ and $y=1$.
Work Step by Step
However, with one-to-one functions, there is exactly one input for each output.
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 9 - Section 9.2 - Inverse Functions - Vocabulary, Readiness & Video Check - Page 549: 9
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