Question

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

Answer 1

$left { {{x-2y =3} atop {x+y= 4}} right. textless = textgreater left { {{4-y-2y=3} atop {x=4-y}} right. textless = textgreater left { {{3y=1} atop {x=4-y}} right. textless = textgreater left { {{y= frac{1}{3} } atop {x=4- frac{1}{3} = frac{11}{3} }} right. \ \ OTBET: ( frac{11}{3}; frac{1}{3} )$