Answer
The function has a definite output variable for particular input variable. This shows that a curve of any function cannot have two different output variables for a particular input variable. This is termed as vertical line test.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 7 - Algebra: Graphs, Functions, and Linear Systems - 7.1 Graphing and Functions - Exercise Set 7.1 - Page 420: 88
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