Question

помогите пожалуйста!!!

Answer 1

1) 
$left { {{x^2-y=-2} atop {2x+y=2}} right. textless = textgreater left { {{y=x^2+2} atop {2x+x^2+2=2}} right. \x^2+2x+2=2;\x^2+2x=2-2;\x*(x+2)=0;$
x₁+2=0   или   x₂=0;
x₁=-2
$left { {{y_1=6} atop {x_1=-2}} right. textless = textgreater left { {{y_2=2} atop {x_2=0}} right.$

2) 
$left { {{x-y=7} atop {x*y=-10}} right. textless = textgreater left { {{x=7+y} atop {y*(7+y)=-10}} right.\y*(7+y)=-10;\y^2+7y+10=0;\D=49-4*10=9=3^2;$
$y_1= frac{-7-3}{2}=-5$ или $y_2= frac{-7+3}{2}=-2$
$left { {{x_1=2} atop {y_1=-5}} right. textless = textgreater left { {{x_2=5} atop {y_2=-2}} right.$

Answer 2

спасибо огромное!!