The Rectangular Equation for the Parametric Surface $x ( u , v ) = u$

Multiple Choice

The rectangular equation for the parametric surface $x ( u , v ) = u$ $y ( u , v ) = v$ and $z ( u , v ) = \frac { v } { 3 }$ is

A) $y = 3 x$
B) $y = - \frac { z } { 3 }$
C) $y = - 3 z$
D) $y = 3 z$
E) $y = \frac { z } { 3 }$