Answer
$3y^5$
Work Step by Step
$6y^7=2\times \underline3\times \underline {y^5} \times y^2$
$9y^6=\underline3\times3\times \underline {y^5} \times y$
$15y^5=\underline3\times5\times \underline {y^5}$
$GCF=3\times y^5=3y^5$
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