Asked by Erica

(a) y''' + y' - xy = x

(b) y'' - y' = xy2

(c)x/y = y'

(d)(xy')' = cos x
Answered by Steve
if you review your text, you can easily find what the order of a DE is. (think of the order of a polynomial).

As for linear, a DE is linear just as a polynomial is linear.

So, take your best guess, and then type your DE in at wolframalpha.com and it will tell you whatcha got. For example,

http://www.wolframalpha.com/input/?i=y%27%27%27+%2B+y%27+-+xy+%3D+x
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