#### Answer

combined variation

#### Work Step by Step

Recall:
(1) A direct variation is represented by the equation $y=kx$ or, in the case of a power of $x$, $y=kx^n$ where $k$ is the constant of variation.
(2) An inverse variation is represented by the equation $y=\dfrac{k}{x}$ where $k$ is the constant of variation.
(3) A joint variation between two variables is represented by the equation $y=kxz$ or, in the case of a power of $x$ and/or $z$, $y=kx^mz^n $ where $k$ is the constant of variation.
Any combination of direct and inverse variations is called a combined variation.
Notice that the given equation involves both direct (a variable on the numerator) and inverse variations (variable/s in the denominator).
Thus, the given equation represents combined variation.