Question 5
Select all the inequalities which hold for all real values of $x$ and $y$.
(i) $x\le x^2+y^2$
(ii) $xy\le x^2+y^2$
(iii) $x-y\le x^2+y^2$
(iv) $y+xy\le x^2+y^2$
(v) $x+y-1\le x^2+y^2$
(i) $x\le x^2+y^2$
(ii) $xy\le x^2+y^2$
(iii) $x-y\le x^2+y^2$
(iv) $y+xy\le x^2+y^2$
(v) $x+y-1\le x^2+y^2$