Determine the Constant of Variation for the Stated Condition $\mathrm { s }$

Multiple Choice

Determine the constant of variation for the stated condition.
- $\mathrm { s }$ varies directly as $\mathrm { r } ^ { 2 }$ , and $\mathrm { s } = 80$ when $\mathrm { r } = 4$ .

A) $\mathrm { k } = 5$
B) $k = 80$
C) $\mathrm { k } = \frac { 1 } { 5 }$
D) $\mathrm { k } = 76$ If y varies directly as x, find the direct variation equation for the situation.