Предмет: Алгебра, автор: mur1306

помогите паже срочно

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Автор ответа: Аноним

$left { {{2x + y=7} atop {xy=6}} right.$
$left { {{y=7 - 2x} atop {xy = 6}} right.$
Первое подставляем во второе:
x(7-2x) = 6
7x - 2x² - 6 = 0
2x² - 7x + 6 = 0
x1 = 2 y1 = 3
x2 = 1,5 y2 = 4

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