Wiktionary
system of equations
n. (context mathematics English) a set of equations required to be met simultaneously or considered as a whole
Usage examples of "system of equations".
The new system of equations fits right into the Prime Radiant and they seem to make it possible to get around the problem of chaos.
It obviously represents not one, but a whole system of equations, in a very contracted form.
Something about the arrival of Mary Smith on the scene has completely fouled up the whole system of equations.