Let $\Gamma ( u , v , w )$ Be a Function of Three Variables With

Multiple Choice

Let $\Gamma ( u , v , w )$ be a function of three variables with $F _ { u } + F _ { w } = - 1$ .Suppose that $G ( x , y ) = F ( x , x - y , x )$ .Simplify $G _ { x } + G _ { y }$ .

A) $G _ { x } + G _ { y } = 0$ .
B) $G _ { x } + G _ { y } = - 1$ .
C) $G _ { x } + G _ { y } = 1$ .
D) $G _ { x } + G _ { y } = - 2$ .