Match the variation statements below with the letters labeling their algebraic equations.

1.  $y$ varies jointly as $x$ and the square of $z$.   2.  $y$ varies jointly as $x$, $y$, and $w$.   3.  $y$ is directly proportional to $x$ and inversely proportional to the cube of $z$.   4.  $y$ varies jointly as $w$ and $z$ and inversely as $x$.

A.  $y = kxz^2$ B.  $y = \displaystyle \frac{kx}{z^3}$ C.  $y = kxyw$ D.  $y = \displaystyle \frac{kwz}{x}$

---