Calculus 10th Edition

Published by Brooks Cole
ISBN 10: 1-28505-709-0
ISBN 13: 978-1-28505-709-5

Chapter P - P.3 - Linear Models and Rates of Change - Exercises - Page 30: 106



Work Step by Step

Let $f$ be a function. Suppose that there exists some vertical, say $x=c$, which intersect the graph of $f$ at two distinct points, say $y_1$ and $y_2$. This means that the function $f$ for the point x has two distinct value, that is, $f(c)=y_1$ and $f(c)=y_2$, $y_1 \neq y_2$. But this result contradicts the hypothesis that $f$ is a function.
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