Question: Combine two plots

Hi!

I am trying to combine the plot in cobweb-diagram.mw (sorry for the messed up axes, you can adjust it in the 'axes properties') with the plot in modèle_graphes.mw. I've tried these two things : test1.mw and test2.mw, but I can't make it work. 

 

Can someone please help me combine these graphics ? Thank you very much for your time.

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