Question

Решите систему уравнений способом сложения
3x+4y+14
5x+2y+14

Answer 1

$left { {{3x+4y+14 = 0} atop {5x+2y+14= 0 }} right. - left { {{3x+4y+14 = 0} atop {5x+2y+14 = 0 | *2}} right. (3x + 4y + 14) - 2(5x + 2y + 14) = 0 -7x - 14 = 0 x = - 2 3( - 2) + 4y + 14 = 0 y = - 2 ( - 2 ; - 2)$