Kindly explain also. I'll upvote

5. Consider the following linear population regression model yi = Bxi + 6 , where y, is the dependent variable, x/ is true but unobserved regressor of interest, and ; is the residual. Assume the means of all variables have been subtracted off, so there is no need for an intercept term. The observed variable is x; and is related to the true variable x/ by x; = x/ + 7. The error in observation n; has mean zero and is uncorrelated with x/ and with e