Näherungspolynom:
Grad: n-1, 2 Punkte → 1. Grad (Gerade)
Polynom: y = a₁x + a₀

P₀	=	(		;		)
P₁	=	(		;		)

y

=

x

+

---

LGS

(Ⅰ)	a₀	+	a₁		=
(Ⅱ)	a₀	+	a₁		=

Ⅰ*=(Ⅰ)·(-A₂₁/A₁₁),→(Ⅰ)·(-a₀/a₀),→(Ⅰ)·(-1)

(Ⅰ*)

-a₀

-

a₁

=

Ⅰ∪=Ⅰ*+Ⅱ

(Ⅰ∪)		a₁	=
		a₁	=

a₁→Ⅰ

(Ⅰ)	a₀	+		=
			a₀	=