If \begin{align*}
2x-y&=3,\\
x+y &=1,
\end{align*}compute $8x-7y$.
Question:
If \begin{align*}
2x-y&=3,\\
x+y &=1,
\end{align*}compute $8x-7y$.
Answer:
Let's think step by step.

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