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Answer
A linear regression model is a model in which a model is linear in parameters i.e. a model is of the following form :
y = b0 + b1x1+ b2x2+ b3x3+ ---------------bnxn+
But Here yi is not linear in b1 and b2(parameters) and hence this is not a linear regression model.
Note :
it can be made linear regression by converting this to log of odds ratio i.e. calculate 1- y then divide y/(1-y) and take log. The result would be linear regression model but at this point above function is not linear regression model
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