Solve clearly

1.Consider the following two simple regression models : Model/ : Y = B+BX, +/ Model II : Y = data, (X, - X)+v, (1) What is the estimator for B,? What is the estimator for a,? Are they the same to each other? Do they have the same variance? (2) What is the estimator for B2? What is the estimator for az? Are they the same to each other? Do they have the same variance