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Ответ

Ответ дан
klementeva2004

Ответ: (8,2;12,6)

Объяснение:

{x-2y=-17

7x-4y=7

{x=2y-17

7•(2y-17)-4y=7

14y-119-4y=7

10y=126

y=12,6

x-2•12,6=-17

x-25,2=-17

x=25,2-17

x=8,2

Ответ:(8,2;12,6

Ответ

Ответ дан
igundane

left{begin{matrix}x-2y=-17 & \ 7x-4y=7 & end{matrix}right.Leftrightarrow left{begin{matrix}x=2y-17 & \ 7x-4y=7 & end{matrix}right.Rightarrow 7(2y-17)-4y=7Leftrightarrow \Leftrightarrow 10y=126Rightarrow y=frac{63}{5}Rightarrow x=frac{41}{5}

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