12x - 7y = 2
12x - 15y = 18 8y = -16 y = -16 : 8 y = -2
12x - 7*(-2) = 2
12x + 14 = 2
12x = -12
x = -1
ответ: ( -1 ; -2)
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12x - 7y = 2
12x - 15y = 18 8y = -16 y = -16 : 8 y = -2
12x - 7*(-2) = 2
12x + 14 = 2
12x = -12
x = -1
ответ: ( -1 ; -2)