x−2y=−12
7x−10y=7
x=-12+2y
7(-12+2y)-10y=7
-84+14y-10y=7
4y=91
y=22.75
x=-12+2*22.75=33.5
Проверка
33.5-2*22,75=-12
x−2y=−12
7x−10y=7
x=-12+2y
7(-12+2y)-10y=7
-84+14y-10y=7
4y=91
y=22.75
x=-12+2*22.75=33.5
Проверка
33.5-2*22,75=-12