Question

Решите систему уравнений /8 класс .СРОЧНО

Answer 1

$\left \{ {{x-y=4} \atop {x^{2}+2xy+y^{2}=4}} \right.$
$\left \{ {{x-y=4} \atop {(x+y)^{2}=4}} \right.$
$\left \{ {{x-y=4} \atop {(x+y)^{2}=4}} \right.$
$\left \{ {{x-y=4} \atop {x+y=+-2}} \right.$
1. $\left \{ {{x-y=4} \atop {x+y=-2}} \right.$
2x = 2
x = 1
$\left \{ {{x=1} \atop {1+y=-2}} \right.$
$\left \{ {{x=1} \atop {y=-3}} \right.$
2. $\left \{ {{x-y=4} \atop {x+y=2}} \right.$
2x = 6
x = 3
$\left \{ {{x=3} \atop {3+y=2}} \right.$
$\left \{ {{x=3} \atop {y=-1}} \right.$

Ответ: (1; - 3) или (3; - 1).