Question

Показательная функция

Answer 1

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