`solve`

. One can define
a system in 3 variables by ```
eqns:={f(x,y,z)=a, g(x,y,z)=b,
h(x,y,z)=c};
```

, where f, g, h are functions of x, y, z, and
a, b, c are constants. To solve this system, one would type
`evalf(solve(eqns, {x,y,z}));`

. One can also
use this for different numbers of equations and variables.Previous: What Lagrange multipliers are, and what they are good for