Consider the following.

$2($x $5)2+($y $3)2+($z $6)2=10,(6,5,8)$

$($a$)$

Find an equation of the tangent plane to the given surface at the specified point.

$($b$)$

Find an equation of the normal line to the given surface at the specified point.

$($x$($t$),$ y$($t$),$ z$($t$))=$