Question

решите систему уравнений
х2-у2=8
х-у=4

Answer 1

x^2-y^2=8
x-y=4
<=>
(x-y)(x+y)=8
x-y=4
<=>
4(x+y)=8
x-y=4
<=>
x+y=2
x-y=4
<=>
2x=6
x-y=4
<=>
x=3
3-y=4
<=>
x=3
y=-1
Ответ: 3; -1.