#### Answer

one-to-one

#### Work Step by Step

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$y=f(x)=4x+20$
Assume that $f(a)=f(b)$
$\ \ \Rightarrow \ \ 4a+20=4b+20\qquad /-20$
$\ \ \Rightarrow \ \ 4a=4b\qquad /\div 4$
$\ \ \Rightarrow \ \ a=b$
$f$ is one-to-one

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

one-to-one

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