Question

{ 12x−14y=52, 9x+7y=4/⋅2; ​ ⇒{ 12x−14y=52, 18x+14y=8. пожалуйста быстрее ​

Answer 1

Ответ: ( 2 ;  -2 )

Пошаговое объяснение:

$\left \{ \begin{array}{l} 12x - 14y = 52 \\\\ 9x + 7y =4 ~~ \big |\cdot 2 \end{array} \right. \Leftrightarrow \oplus \left \{ \begin{array}{l} 12x - 14y = 52 \\\\ 18x + 14y =8 ~~ \end{array} \right. \Leftrightarrow \\\\\\ 12 x + 18x + 14y - 14y = 52 + 8 \\\\ 30x = 60\\\\ x = 2 \\\\ 9x + 7y = 4 \\\\ 9\cdot 2 + 7y = 4 \\\\ 7y = 4 - 18 \\\\ 7y = -14 \\\\ y = -2$

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