{x-y:2+ x+y:3=1 , {x-y:3+x+y:4=1;

Question

{x-y:2+ x+y:3=1 , {x-y:3+x+y:4=1;

Answer 1

X=1+y
(1+y)*(1+y)*(1+y)-y*y*y=7
1 + 3y + 3y*y + y*y*y - y*y*y=7
1+3y+3y-y=7
y=1
y= -2