If the root sign 2x + y + x-2y = 0, find X & # 178; + Y & # 178;

If the root sign 2x + y + x-2y = 0, find X & # 178; + Y & # 178;

If the sum of two non negative numbers is 0, then both numbers are 0
2x+y=0,x-2y=0
The simultaneous solution is: x = 0, y = 0
So x ^ 2 + y ^ 2 = 0 + 0 = 0