# Summary

This chapter formally introduced the definition of functions and variables in the context of mathematics. Various topics relevant to functions, such as the domain, the range, and the plot of a function, were also discussed. In the second part of the chapter, we talked about the concept of equations and systems of equations, as well as special methods to find their solutions. During these discussions, the SymPy library and the function to compute the inverse of a matrix from NumPy were also examined. We concluded the chapter by completing a task that used algebra and functions to construct a multi-variable break-even analysis for a business.

In the next chapter, we will continue with another important topic in mathematics: sequences and series.