Question

Срочно!!!!
Систему уравнений

Answer 1

$left { {{x^2+y^2=5} atop {x-y=1}} right.$

$left { {{(1+y)^2+y^2=5} atop {x=1+y}} right.$

$left { {{2y^2+2y-4=0} atop {x=1+y}} right.$

$2y^2+2y-4=0$

$y^2+y-2=0$

$D=9=3^2.$

$y_{1} =1; y_{2} =-2.$

$x_{1} =2, x_{2}=-1.$