Question

Помогите решить , Решение систем линейных уравнений
{x-3y=7
{-7+y=-69

Answer 1

$\left \{ {{x+3y=7} \atop {-7+y=-69}} \right. \\\left \{ {{x+3y=7} \atop {y=7-69}} \right. \\\left \{ {{x-62*3=7} \atop {y=-62}} \right. \\\left \{ {{x=193} \atop {y=-62}} \right.$