1. **State the problem:** We need to find the system of equations representing the original prices of a mirror ($m$) and a vase ($v$) given their combined original price and the combined sale price after discounts.
2. **Given:**
- Original combined price: $m + v = 60$
- Mirror discount: 25%, so sale price of mirror is $75\%$ of $m$, i.e., $0.75m$
- Vase discount: 45%, so sale price of vase is $55\%$ of $v$, i.e., $0.55v$
- Combined sale price: $0.75m + 0.55v = 39$
3. **Form the system of equations:**
$$\begin{cases} m + v = 60 \\ 0.75m + 0.55v = 39 \end{cases}$$
4. **Explanation:**
- The first equation states the total original price.
- The second equation accounts for the discounts applied to each item and their combined sale price.
5. **Match with options:** This corresponds to option C.
**Final answer:** Option C
Discount System
Step-by-step solutions with LaTeX - clean, fast, and student-friendly.