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The lines $-2x + y = k$ and $0.5x + y = 14$ intersect when $x = -8.4$. What is the value of $k$?

 May 26, 2021
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At $x=-8.4$ in the second equation, $y=14+4.2=18.2$. Then plug this into the first equation along with $x$ to find $k$.

 May 26, 2021

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