Question

решите систему уравнений lgx-lgy=2 x- 10y=900

Answer 1

$left { {{lgx-lgy=2} atop {x-10y=900}} right.\left { {{lg(frac{x}{y})=2} atop {x-10y=900}} right.\left { {{frac{x}{y}=100} atop {x-10y=900}} right.\left { {{x=100y} atop {100y-10y=900}} right.\left { {{x=100y} atop {90y=900}} right.\left { {{x=1000} atop {y=10}} right.$

Ответ: (1000;10)