How can I draw a basic differential equation in Simulink?

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Homework Statement

Hi,

I was wondering if someone could help me create a basic differential equation in Simulink. I'm trying to create the following equations

http://imageshack.com/a/img197/1379/cic.PNG

I tried using this as an example http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/ ODE to help me solve this problem but it doesn't seem to help. The link above has a very similar ODE. When I create two of what is done in the example and try and connect it to a XY Graph I don't get anything so I'm doing something wrong but am not sure what. Thanks for any help.

Homework Equations

The Attempt at a Solution

 

[NascentOxygen]

http://blogs.mathworks.com/seth/2008/05/23/how-to-draw-odes-in-simulink/%20ODE

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