x = 3 - 4y
3(3 - 4y) + 14y - 19 = 0
9 - 12y + 14y - 19 = 0 2y - 10 = 0 2y = 10 y = 5
x = 3 - 4(5) x = 3 - 20 x = -17
Ответ: x = -17, y = 5