\documentclass{article}

\usepackage[linesnumbered]{algorithm2e}
\usepackage{hyperref}

\renewcommand{\algorithmautorefname}{Algorithm}
\renewcommand{\AlgoLineautorefname}{Line}

\begin{document}

See \autoref{alg:myalg}, specifically \autoref{algl:y}.

\begin{algorithm}
  \caption{An algorithm}\label{alg:myalg}
  Do X\;
  Do Y\nllabel{algl:y}\;
  $x = y + z$\;
\end{algorithm}

\end{document}