Find the Constant of Variation for the Stated Condition: Y $k = \frac { 1 } { 9 }$

Multiple Choice

Find the constant of variation for the stated condition: y varies directly as x , and y = 225 when x = 100.

A) $k = \frac { 1 } { 9 }$
B) $k = \frac { 1 } { 4 }$
C) $k = \frac { 9 } { 4 }$
D) $k = 22,500$
E) $k = \frac { 4 } { 9 }$