Given that Lucy had 72 dollars, which is nine times as much as Xavier had, we can select the right method which represents Xavier's money in the steps below.
Let Xavier's money be x. Since Lucy has nine times more money than Xavier we can say that Lucy's money is;
![9* x=9x](https://img.qammunity.org/2023/formulas/mathematics/high-school/4fhkcm0ppqr5ql7nxnfg5qqh9ikp2q78je.png)
Since Lucy also had 72 dollars we can say;
![\begin{gathered} 9x=72 \\ (9x)/(9)=(72)/(9) \\ x=8 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/high-school/q8ikpk16608suz8ejst6zf428ugaz1a16v.png)
Therefore, the right answer would be;
Answer: Option C