Răspuns :
[tex]\it f:\{0,\ \ 1,\ \ 2,\ \ 3\}\ \longrightarrow\ \mathbb{R},\ \ f(x)=x-m\\ \\ \\ A(1,\ 5)\in Gf \Rightarrow f(1)=5 \Rightarrow 1-m=5|_{-1} \Rightarrow -m=4|_{\cdot(-1)} \Rightarrow \ m=-4\\ \\ \\ f:\{0,\ \ 1,\ \ 2,\ \ 3\}\ \longrightarrow\ \mathbb{R},\ \ \ \ \ \ f(x)=x-4[/tex]