1. The problem statement, all variables and given/known data number of years(x): [1,2,3,4,5,6,] number of accidents(y): [12,6,5,4,2,2] or (1,12),(2,6),(3,5),(4,4),(5,2),(6,2) 2. Relevant equations the relation between x and y is on the form: y = a + b(1/x) by changing (1/x) to z, the model become linear instead of inverse. use this to 'find' a and b 3. The attempt at a solution y = a+b(1/x) z = 1/x y = a+bz matrix A = [(1,1),(1,2),(1,3),(1,4),(1,5),(1,6)] vector y = [12,6,5,4,2,2] vector x = [a,b] finds a solution to ATAx = ATy 6a + 21b = 31 21a + 91b = 77 a = 11.4557 b = -1.8 y = 11.4667 - 1.8/x but this is wrong the right answer is: y = 0.3914 + 11.6945/x i think my problem is how to deal with z and 1/x.