Odpowiedź:
A = ( - 4 , - 1 ) , B = ( 5 , 5 )
xa = - 4 , xb = 5 , ya = - 1 , yb = 5
(xb - xa)(y - ya) = (yb - ya)(x -xa)
(5 + 4)(y + 1) = ( 5 + 1)(x + 4)
9(y + 1) = 6(x + 4)
9y + 9 = 6x + 24
9y = 6x + 24 - 9
9y = 6x + 15
y = (6/9)x + 15/9
y = 2/3x + 5/3
Odp: B