Given the below code, how can I plot X vs. V?

Can you help me as what is wrong with my code? I'm trying to plot X vs V ( X as a function of Volume) but I get my code to be linear and unreasonable.

See attachments please, I have a problem understanding plotting basics

[KSSV]

Problem could be with ODE45..you are not using it properly...Read the documentation of ODE45.

[Jan]

The screenshots are not useful. Prefer to post such small pieces of code directly as text in the question using the "{} Code" button. Thanks.

Remember that all we see is the running Matlab code and your statement, that you expect a different solution. How can we suggest an improvement based on these information?