Х+у =3-х+у 4 2 3х+2у - х+3у =5 3 7 решите уравнение способом подстановки
х+у=3-х+у
423х+2у-х+3у=537
423x+2y-x+3y=537
y=-84.4x+107.4 х+у=3-х+у x+(-84.4x+107.4)=3-x+(-84.4x+107.4)
-82.4x+104.4+84.4x-107.4=0
2x-3=0
x=3/2 x=1.5 423x+2y-x+3y=537 423*(1.5)+2y-1.5+3y=537
96+5y=0
y=-96/5
y=-19.2