If \begin{align*}
2x-y&=3,\\
x+y &=1,
\end{align*}compute $8x-7y$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
If \begin{align*}
2x-y&=3,\\
x+y &=1,
\end{align*}compute $8x-7y$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
13
If \begin{align*}
2x-y&=3,\\
x+y &=1,
\end{align*}compute $8x-7y$.
train