Question

x + y = -4
4х + 3у=-9
методом додавання

Answer 1

Ответ:

(1; -5)

Объяснение:

$\left \{ {{x + y = -4} | *(-4) \atop {4x + 3y = -9}} \right. \\\\\left \{ {{-4x - 4y = 16} \atop {4x + 3y = -9}} \right. \\\\-4x - 4y + 4x + 3y = 16 + (-9)\\\\-4y + 3y = 5\\\\-y = 5\\\\y = -5\\\\x = -4 - (-5) = -4 + 5 \\\\x = 1$