Rewrite equation to solve for $x$, not $y$ I am doing calculus integration, and need to show my work for Horizontal slicing (even though Vertical slicing is far easier). 
The equation is $$y= x/\sqrt{2x^2+1}$$
I need to rewrite the equation so that it is $x=\;...$ in order to horizontally slice it (in other words, it should be rewritten so that it is dependent on $y$). 
This isn't exactly a calculus question, although it is being used for calculus. I'm probably missing something that is pretty obvious. 
Any help would be greatly appreciated!

If you are working on an interval where $x\ge 0$, $$\begin{align}
\frac{x}{\sqrt{2x^2+1}}&=\sqrt{\frac{x^2}{2x^2+1}}
\\
&=\sqrt{\frac{2x^2+1-1}{2(2x^2+1)}}
\\
&=\sqrt{\frac{1}{2}\left(1-\frac{1}{2x^2+1}\right)}
\end{align}$$
Now that there's only one instance of $x$ on the right side, you should be able to more easily solve for $x$.
