**Solving a Variation Problem**

** **

*Step 1:- *Write the variation equation.

*Step 2 :- *Substitute the initial values and solve for *k*.

*Step 3 :- *Rewrite the variation equation with the value of *k *from Step 2.

*Step 4:- *Substitute the remaining values, solve for the unknown, and find the required answer.

**Direct Variation as a Power**

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*y *varies directly as the *n*th power of *x *if there exists a real number *k *such that

*y *= *kx** ^{n}*.