Determine whether the equation is linear or nonlinear by matching it with $(6)$ in Section $1\mathrm{.}1.$

an$($x$)$

dnydxn

$+$ an $1($x$)$

dn $1$ydxn $1$

$++$ a$1($x$)$

dydx

$+$ a$0($x$)$y $=$ g$($x$)(6)$

linearnonlinear$$