Answer
$xy$
Work Step by Step
The $GCF$ of $
x,x,
$ and $
x
$ is $
x
.$
The $GCF$ of $
y,y^2,
$ and $
y^3
$ is $
y
.$
Hence, the $GCF$ of the given expressions, $
xy,xy^2,
\text{ and } xy^3
,$ is
\begin{array}{l}\require{cancel}
xy
.\end{array}