5x + y = 20
2x - y = 1
7x = 21
x = 3
6 - y = 1
x = 3y = 5
ответ: 3;5
2x + 3y = 2
-2x + 5y = - 18
8y = - 16
y =-2
2x-6=2
y =-2x = 4
ответ: 4;-2
5x + y = 20
2x - y = 1
7x = 21
2x - y = 1
x = 3
6 - y = 1
x = 3
x = 3y = 5
ответ: 3;5
2x + 3y = 2
-2x + 5y = - 18
8y = - 16
2x + 3y = 2
y =-2
2x-6=2
y =-2
y =-2x = 4
ответ: 4;-2