Simulink uses the general-purpose ode45 by default.

You need to translate the differential equation system in the graphical Simulink language (with some effort).

Otherwise, you have to proceed with a script using ode45.m directly.

Dear Researcher

This is code,

https://www.mathworks.com/help/symbolic/solve-a-system-of-differential-equations.html

I wish the best for you with Regards

Please refer the solution on the link: https://www.researchgate.net/post/Modeling_a_system_of_differential_equation_using_Simulink_Matlab