Question

Решите систему уравнений:
{3х+8у=16
{2х-4у=-36

Answer 1

$2x-4y = -36 => 4x - 8y = -72\\3x + 8y = 16\\4x-8y+3x+8y = 16 - 72\\7x = -56 => x = -8\\3x + 8y = 16 => 8y = 16 - 3x = 16 + 24 = 40 => y = 5\\Answer: (-8; 5)$