Răspuns :
x = abscisa
y= ordonata (x=y)
A(x,x) ∈ Gf => f(x)=x
inlocuim :
f(x) =2x+1=x=>2x-x=-1=>x=-1
=>A(-1,-1)
y= ordonata (x=y)
A(x,x) ∈ Gf => f(x)=x
inlocuim :
f(x) =2x+1=x=>2x-x=-1=>x=-1
=>A(-1,-1)