MHB -307 order and whether or not it is linear

[karush]

ov 347 nmh{978}
Determine the order and whether or not the equation is linear.
$$x^2 \frac{{d}^{2}y}{dx^2}+x\frac{dy}{dx}+2y=\sin\left({x}\right)$$
My quess is this 2nd order, but the ans says it is linear not sure why.

 

[Prove It]

A DE that is written as a linear combination of its derivatives (in other words, a SUM of its derivatives) is a linear DE.