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2014-09-30T18:33:09+03:00
2x+3y=620
{x,y}dp{5,7}
x/5=k  ⇒x=5k
y/7=k  ⇒y=7k
inlocuim in relatia 2x+3y=620⇒
2·5k+3·7k=620
10k+21k=620
31k=620
k=620/31=20
x=5k=5·20⇒   x=100
y=7k=7·20⇒   y=140
verificare
2·100+3·140=620
200+420=620

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