2x -7 = y
Подстановка: 4x + 3(2x-7) = -1
4x + 6x - 20 = 0
10x = 20
x = 2
2*2 - y = 7
4 - y = 7
y = -3
Ответ: (2; -3)
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2x -7 = y
Подстановка: 4x + 3(2x-7) = -1
4x + 6x - 20 = 0
10x = 20
x = 2
2*2 - y = 7
4 - y = 7
y = -3
Ответ: (2; -3)