Solve the following system of equations using elimination or substitution method. If there are no solutions, type "N" for both $x$ and $y$. If there are infinitely many solutions, type "x" for $x$, and an expression in terms of $x$ for $y$. $$\begin{aligned} -5 x+ y &=5\\ 15 x - 3 y &=8 \end{aligned}$$

$x=$ $y=$