if yhat=74.80+19.72x Then what can we say about E(y)= Bo + B1x?

if yhat=74.80+19.72x 

Then what can we say about E(y)= Bo + B1x?

1. all statements are true 

2. a plot of predicted yhat values and x values would NOT result in a straight line 

3. the appraised value of y and x for the entire population of houses would fall in a straight line 

4. a plot of mean appraised value of E(y) and x for entire population would be in a straight line