Question

решите систему уравнений

Answer 1

$left { {{5^{x-1}*7^y=7^{-1}} atop {y=x-2}} right. \ left { {{5^{x-1}*7^{x-2}=7^{-1}} atop {y=x-2}} right. \ left { {{5^{x-1}*7^{x-1}*7^{-1}=7^{-1}} atop {y=x-2}} right. \ left { {{5^{x-1}*7^{x-1}=1} atop {y=x-2}} right. \ left { {{(5*7)^{x-1}=1} atop {y=x-2}} right. \ left { {{35^{x-1}=35^0} atop {y=x-2}} right. \ left { {{x-1=0} atop {y=x-2}} right. \ left { {{x=1} atop {y=-1}} right.$