Linear model or not linear?

This is a question from a past paper exam.
i is linear, iii is not linear, that's fine.
But the solutions to this claim that ii IS linear.
I think that it is not because alpha and beta and raised to different powers.
Can anybody give an opinion on this?



Less is more. Stay pure. Stay poor.
Depends on what they want: linear in terms or linear in shape. I would just simulate them and see what they look like.


Well-Known Member
ii can be written Y = A +BX where B is a constant = 1/beta and X is 1/x.
So I would call it a linear model (more or less by definition.)