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If $4u-5v=23$ and $2u+4v=-8$, find the value of $u+v$.

 Jul 9, 2022
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4u - 5v = 23

2u + 4v = -8

 

Then 4u + 8v = -16.  Therefore, 3v = 39, and v = 13.  Subsituting, we get that u = 22, so u + v = 22 + 13 = 35.

 Jul 9, 2022

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