How do I solve equations simultaneously?

Question

Often teachers ask to "solve an equation simultaneously" and i just don't get what it means and how it works

Answer 1

In mathematics, simultaneous equations and systems of equations are finite sets of equations whose common solutions are looked for. The systems of equations are usually classified in the same way as the single equations, namely:
System of linear equations
System of polynomial equations
System of ordinary differential equations
System of partial differential equations