#### Answer

$\dfrac{10}{y^2}$

#### Work Step by Step

Adding the numerators and copying the denominator, the given expression, $
\dfrac{8}{y^2}+\dfrac{2}{y^2}
,$ simplifies to
\begin{array}{l}\require{cancel}
\dfrac{8+2}{y^2}
\\\\=
\dfrac{10}{y^2}
.\end{array}