y = x - 5
4x + y = 10
----------------
4x + x - 5 = 10
5x = 15
x = 3
y = -2
Ответ: x = 3, y = -2
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y = x - 5
4x + y = 10
----------------
y = x - 5
4x + x - 5 = 10
----------------
y = x - 5
5x = 15
----------------
x = 3
y = -2
Ответ: x = 3, y = -2