Question

РЕШИТЬ УРАВНЕНИЕ
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Answer 1

4)  $\left \{ {{\frac{x}{5}+\frac{y}{5}=2 } \atop {\frac{x}{8}+\frac{y}{4} =2 }} \right.$

$\left \{ {{x=10-y} \atop {\frac{x}{8} +\frac{y}{4}=2 }} \right.$

$\frac{10-y}{8} + \frac{y}{4} =2$

$y=6$

$x=10-6$

$x=4$

$(x, y) = (4,6)$

Проверка:

$\left \{ {{\frac{4}{5}+\frac{6}{5} =2 } \atop {\frac{4}{8} +\frac{6}{4}=2 }} \right.$

$\left \{ {{2=2} \atop {2=2}} \right.$

( x, y ) = ( 4, 6 )