Compute the Indicated Derivative Using the Chain Rule $y = 7 x - 6$

Multiple Choice

Compute the indicated derivative using the chain rule. $y = 7 x - 6$ ; $\frac { \mathrm { d } x } { \mathrm {~d} y }$

A) $\frac { 7 } { 6 }$
B) 6
C) 7
D) $\frac { 1 } { 6 }$
E) $\frac { 1 } { 7 }$