A finite set of equations in the same unknowns of which the common solutions have to be determined. Solution of simultaneous equations in implemented in the Wolfram Language as Solve[eqns, vars], and as Reduce[eqns, vars].
Simultaneous Equations
See also
System of EquationsThis entry contributed by Margherita Barile
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Barile, Margherita. "Simultaneous Equations." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/SimultaneousEquations.html