x - 3y = 7
2x - 3y = -3
из второго вычитаем первое
2x - 3y - x + 3y = -3 - 7
x = -10
-10 - 3y = 7
-3y = 17
y = -17/3
ответ {-10, -17/3}
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Verified answer
x - 3y = 7
2x - 3y = -3
из второго вычитаем первое
2x - 3y - x + 3y = -3 - 7
x = -10
-10 - 3y = 7
-3y = 17
y = -17/3
ответ {-10, -17/3}