Decide whether the expression $$\frac{8 y}{4 y + 2}$$ can be put in the form $$\frac{ax}{a+x},$$ where $a$ is a constant and $x$ may involve variables. If it can be put in this form, identify $a$ and $x$. If it cannot be put in this form, enter NONE for both $a$ and $x$ below.

$a =$ help (number or formula)
$x =$ help (number or formula)