Question

determinati numarul natural xy cu linie orizontala care verifica relatiaxy cu lunie orizontala egal cu 3x+5y

Answer 1

[tex]\overline{xy}=3x+5y\;;\\ \Rightarrow\;10x+y=3x+5y\;;\\ .\;\;10x-3x=5y-y\;\Leftrightarrow\;7x=4y\;\rightarrow\;x=4\;si\;y=7\,;\\ deci\;\overline{xy}=47\;;\\ Proba:\;47=3*4+5*7=12+35=47\;\;(A)[/tex]