Question

$\frac{1}{3} v - \frac{1}{8}u = 3 \\ 7u + 9v = - 2$Решите систему уравнений
Способом сложения.
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Answer 1

$\left \{ {{\frac{1}{3} v-\frac{1}{8}u}=3|*24 \atop {7u+9v=-2}} \right.\\\\\\\left \{ {{-3u+8v=72}|*7 \atop {7u+9v=-2}|*3} \right.\\\\\\+\left \{ {{-21u+56v=504} \atop {21u+27v=-6}} \right.\\--------\\ 83v=498\\\\v=6\\\\\frac{1}{8}u=\frac{1}{3}v-3=\frac{1}{3}*6-3=2-3=-1\\\\u=-1:\frac{1}{8}=-1*8=-8\\\\Otvet:\boxed{(-8;6)}$