The systolic blood pressure dataset (in the spreadsheet I have attached a photo of) contains the systolic blood pressure and age of 30 randomly selected patients in a medical facility. What is the equation for the least square regression line where the independent or predicto dependent or response variable is systolic blood pressure?

Patient 9 is 67 years old and has a systolic blood pressure of 158 mm Hg. What is the residual?

Is the actual value above, below, or on the line?

What is the interpretation of the residual?