{х+2у=550 {5х+3у=1700 х+2у=550 х=550-2у
2750-10у+3у=1700. -7у=1700-2750. -7у=-1050. у=150
х=550-2•150=250. (250;150)
2750-10у+3у=1700. -7у=1700-2750. -7у=-1050. у=150
х=550-2•150=250. (250;150)