Question

ну помогите/\_/\
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Answer 1

Ответ:

Объяснение:

$\displaystyle \left \{ {{x-2y=-12} \ \ \atop {7x-12y=7 }} \right. => \left \{ {{x=2y-12 } \atop {7x-12y=7 }} \right. => \\\\\\ 7(2y-12 )-12y =7 \\\\ 14y-84-12y=7 \\\\ 2y=91 \\\\ y =45 \frac{1}{2} \ \ ; \ \ x =2\cdot \frac{91}{2} -12=91-12=79 \\\\\\ Otvet : (79 \ \ ; \ \ 45,5 \ )$