Answer
$\frac{2}{3y}$
Work Step by Step
$70=2\times\underline5\times\underline7$
$105=3\times\underline5\times\underline7$
$GCF=5\times7=35$
$\frac{70}{105y}=\frac{70\div35}{105y\div35}=\frac{2}{3y}$
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