Answer
$y=\log_{5}x$
Work Step by Step
We know the function takes the form:
$y=\log_{a}x$
We wish to find the base $a$. We use the point given: $(5,1)$
$1=\log_{a}5$
$a^1=5$
$a=5$
Therefore the function is:
$y=\log_{5}x$
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