Question

Решите систему уравнений методом подстановки.$\left \{ {{x-2y=0} \atop {x+7y=54}} \right.$

Answer 1

$\left \{ {{x - 2y = 0} \atop {x + 7y = 54}} \right. \\\left \{ {{x = 2y} \atop {2y + 7y = 54}} \right. \\\left \{ {{x = 2y} \atop {9y = 54}} \right. \\\left \{ {{x = 2y} \atop {y = 6}} \right. \\\left \{ {{x = 2*6} \atop {y = 6}} \right. \\\left \{ {{x = 12} \atop {y = 6}} \right.$

Ответ: x = 12; y = 6.