Question

Решите систему!!!!!
2x-2y=x+y
x^2-y^2=8

Answer 1

{2x-2y=x+y⇒2x-x=2y+y⇒x=3y
{x²-y²=8
9y²-y²=8
8y²=8
y²=1
y1=-1⇒x1=-3
y2=1⇒x2=3
(-3;-1);(3;1)