Solve Problems Involving Joint Variation
- $z$ Varies Jointly As $y$ And the Cube Of

Multiple Choice

Solve Problems Involving Joint Variation
- $z$ varies jointly as $y$ and the cube of $x ; z = 80$ when $x = 2$ and $y = - 5$

A) $y = - 2 x ^ { 3 } y$
B) $y = - 2 x y ^ { 3 }$
C) $y = 2 x ^ { 3 } y$
D) $y = 2 x y ^ { 3 }$