Question

X+y=3 Система x-y=7 Ввврврвоаввлввввввввввчоввввоврв

Answer 1

{х+у=3 {х=3-у
{х-у=7 =》{(3-у)-у=7

(3-у) -у = 7
3-у - у = 7
-у-у=7-3
-2у=4
у=4: (-2)
у = -2
х=3-2=1
Ответ : (1;-2)

Это способ подстановки

Answer 2

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