Question

$14x - 8y = - 6 \\ 21x + 10y = 2$
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Answer 1

Ответ:

$\bigg (-\dfrac{1}{7}; \ 0,5 \bigg )$

Объяснение:

$\displaystyle \left \{ {{14x-8y=-6} \atop {21x+10y=2}} \right. \Leftrightarrow \left \{ {{70x-40y=-30} \atop {84x+40y=8}} \right. \bigg | + \Leftrightarrow \left \{ {{154x=-22} \atop {y=\dfrac{2-21x}{10}}} \right. \Leftrightarrow \left \{ {{x=-\dfrac{1}{7}} \atop {y=0,5}} \right. ;$

$\bigg (-\dfrac{1}{7}; \ 0,5 \bigg );$