(PUC) O domínio da Relação $\,P\,=\,\lbrace \,(x;y)\,\in\,\mathbb{N}\times \mathbb{N}\,\mid \,y\,=\,x-5 \,\rbrace\,$ é:
d)
$\lbrace \,x\,\in\,\mathbb{N}\,\mid\,x \,\geqslant \,6\,\rbrace\,$
e)
$\lbrace \,x\,\in\,\mathbb{N}\,\mid\,x \,\geqslant \,5\,\rbrace\,$
