Question

Показательная функция

Answer 1

$left { {{x - y = 4} atop { {5}^{x + y} = 25 }} right. left { {{x - y = 4} atop { {5}^{x + y} = {5}^{2} }} right. \ left { {{x - y = 4} atop { {x + y} = {2} }} right. left { {{2x = 6} atop { {x + y} = {2} }} right. \ left { {{x = 3} atop { {y} = { - 1} }} right.$