Software for mathematical and physical modeling and also for solving a system of simple equations in windows?

Question

Mathematics

Solve equations in excel. (slow but clear and simple). You can simply solve systems of simple equations besides excel. (fortran and matcad something is not very simple there)
And how in software for example alpha** they model 3d graphics and there is software for physical modeling - gravitational interaction of astro objects? (some astro games seen with similar)

Answer 1

Nice Jupyter notebook (python) tool. It cannot be said that it is very simple. Approximately at the level of matcad / matlab. But compared to your subject area, this should not cause problems.

Answer 2

In Matlab, the system of linear equations has the form A*x = b
The solution will be x = A \ b,
where "\" is the left division (b is "divided" by A),
x and b are column vectors, A is a matrix.