386. What type of function is an algebraic function of several variables $x, y, z \ldots$, if the function does not change when $k x$ is substituted for $x$, $k y$ for $y$, and so on?
386. Homogeneous, of zero degree; for example, $\frac{x^{3}+x^{2} y+y^{3}}{x^{3}-7 x y^{2}-5 y^{3}}$.