Решите систему уравнений методом подстановки x-2y =3 x+y= 4

[latex] left { {{x-2y =3} atop {x+y= 4}} ight. extless = extgreater left { {{4-y-2y=3} atop {x=4-y}} ight. extless = extgreater left { {{3y=1} atop {x=4-y}} ight. extless = extgreater left { {{y= frac{1}{3} } atop {x=4- frac{1}{3} = frac{11}{3} }} ight. \ \ OTBET: ( frac{11}{3}; frac{1}{3} )[/latex]