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) Endpoint: (9,-10), midpoint: (4,8)
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) Endpoint: (9,-10), midpoint: (4,8)

User JaMiT
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\begin{gathered} \Rightarrow(4,8)=((9+x)/(2),(-10+y)/(2)) \\ \Rightarrow4=(9+x)/(2)\Rightarrow x=-1 \\ \Rightarrow8=(-10+y)/(2)\Rightarrow y=26 \\ \text{The other endpoint is (-1,26)} \end{gathered}

User Vlazzle
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