Question

resolva o sistema 3x+4y=-5 (×+3y=-5​

Answer 1

$\left \{ {{3x+4y=-5} \atop {x+3y=-5}} \right. = x = -5 - 3y\\\\3(-5-3y) +4y = -5\\-15 - 9y +4y = -5\\-5y = 10\\y = \frac{10}{-5} \\y = -2\\x+3(-2) = -5\\x = -5 +6\\x = 1$