funkcija oblika
f ( x 1 , x 2 , . . . . x n ) = a 1 x 1 + a 2 x 2 + . . . . + a n x n {\displaystyle f(x_{1},x_{2},....x_{n})=a_{1}x_{1}+a_{2}x_{2}+....+a_{n}x_{n}}
