Solve simultaneous logarithmic equations with different bases?

How do I solve these simultaneous equations?

$2lo{g}_{x}y+2lo{g}_{y}x=5$

$xy=8$

I've tried to convert the first formula to fraction form and continue from there, but I can't seem to get anywhere. I've tried to do

$x=8/y$

and substitute to the first equation, but I still can't seem to solve this. How do I go about in solving these types of equations?

How do I solve these simultaneous equations?

$2lo{g}_{x}y+2lo{g}_{y}x=5$

$xy=8$

I've tried to convert the first formula to fraction form and continue from there, but I can't seem to get anywhere. I've tried to do

$x=8/y$

and substitute to the first equation, but I still can't seem to solve this. How do I go about in solving these types of equations?