A1=(2*1+1;6*1+1)
A1 (3,7)
A2=(2*2+1` ;6*2+1)
A2(5;13)
Scrii ecuatia dreptei care trece prin 2 Puncte
(y-yb1)/(yb2-yb1)=(x-xa1)/(xa2-xa1)
(y-7)/(13-7)=(x-3)/(5-3)
(y-7)/6=(x-3)/2
(y-7)/3=(x-3)
y-7=3(x-3)
y-7=3x-9
y=3x-9+7=0
y=3x-2
Inlocuiest pe x cu 2n+1 si y=6n+1 si verifici daca egalitatea
se pastreaza
6n+1=3*(2n+1)-2
6n+1=6n+3-2
6n+1=6n+1 Adevarat ∀n∈N