Weight System 9D115D
1. **Stating the problem:**
We are given the weights of Cindi, Dania, and Eva with the following conditions:
- The sum of Cindi's and Dania's weights is 78 kg.
- The sum of Dania's and Eva's weights is 82 kg.
- Three times Eva's weight minus Cindi's weight is 88 kg.
We denote Cindi's weight as $x$, Dania's weight as $y$, and Eva's weight as $z$. We need to find the system of linear equations (SPLTV) that represents these conditions.
2. **Formulating the equations:**
- From "Jumlah berat badan Cindi dan Dania 78 kg":
$$x + y = 78$$
- From "Jumlah berat badan Dania dan Eva 82 kg":
$$y + z = 82$$
- From "Tiga kali berat badan Eva dikurangi berat badan Cindi 88 kg":
$$3z - x = 88$$
3. **Writing the system:**
$$\begin{cases}
x + y = 78 \\
y + z = 82 \\
- x + 3z = 88
\end{cases}$$
4. **Explanation:**
- The first equation sums $x$ and $y$.
- The second sums $y$ and $z$.
- The third rearranges "three times Eva minus Cindi" as $3z - x$.
5. **Matching with options:**
Option B matches exactly:
$$\{\begin{cases} x + y = 78 \\ y + z = 82 \\ -x + 3z = 88 \end{cases}\}$$
**Final answer:** Option B.