# linear system

Discussion in 'Homework Help' started by lynda, Mar 21, 2013.

1. ### lynda Thread Starter New Member

Mar 21, 2013
2
0
hi guys, can u solve this for me:

prove that this system is not linear.

y(t)dy(t)/dt + 3y(t) = x (t).

prove in terms of homogeneity and additive. thanks !

2. ### WBahn Moderator

Mar 31, 2012
18,085
4,917
We COULD solve it for you, but we WON'T. This is YOUR homework. This is the Homework Help forum, not the Homework Done For You forum.

You need to show YOUR efforts to solve YOUR homework problem. We will then use those efforts as a springboard for assisting you to find your way along a path to a solution.

Last edited: Apr 4, 2013
3. ### lynda Thread Starter New Member

Mar 21, 2013
2
0
WBahn..
as a senior u show your responsibility and realized me. thanks !

4. ### WBahn Moderator

Mar 31, 2012
18,085
4,917
You're welcome... I guess.

5. ### ProfMimi New Member

Apr 19, 2013
3
0
To prove that a system is not linear, you should find a linear combination of two inputs a*x1(t)+b*x2(t) that does not yield a*y1(t)+b*y2(t) as an output. Try out some values of a and b, and see what happens to the output. For example, what if you take 2x as an input, do you get 2y as the output?