Pешиtи сисtему уpавнений 2х-3у=1 3х+у=7

2х-3у=13х+у=7 2х-3у = 1у=7-3х2х -3(7-3х) = 1у= 7-3х2х-21+9х =1у = 7-3х11х = 22у= 7-3хх=2у= 7-6х=2у=1