# Chapter 6 - Section 6.1 - The Greatest Common Factor and Factoring by Grouping - Exercise Set - Page 427: 9

$xy$

#### 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}

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