Question

помогите решить, пожалуйста
срочно надо

Answer 1

$left { {{x-y=1} atop {xy=6}} right. left { {{x=1+y} atop {xy=6}} right. \ (1+y)*y=6 \ y=2 \ y=-3 \ x=3 \ x=-2 \ ( x_{1}, y_{1} ) =(3;2) \ ( x_{2}, y_{2} )=(-2;-3) \ left { {{3-2=1} atop {3*2=6}} right. \ left { {{-2-(-3)=1} atop {-2*(-3)=6}} right. \ left { {{1=1} atop {6=6}} right. \ left { {{1=1} atop {6=6}} right. \ ( x_{1}, y_{1} ) =(3;2) \ ( x_{2}, y_{2} )=(-2;-3)$
$left { {{x^2+2y^2=228} atop {3x^2-2y^2=172}} right. \.................... \ 4x^2=400 \ x=-10 \ x=10 \ .................. \ 10^2+2y^2=228 \ 2y^2=128 \ y^2=64 \ y=-8 \ y=8 \ ( x_{1}, y_{1} ) =(-10;-8) \ ( x_{2}, y_{2} )=(10;8)$