Ответ:
x+y=4
x-y=-2
x=4-y
4-y-y=2
4-2y=2
2y=2
y=1
x=3
Ответ: (3;1)
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Ответ:
x+y=4
x-y=-2
x=4-y
4-y-y=2
4-2y=2
2y=2
y=1
x=3
Ответ: (3;1)