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.

Using the formula y=bx+a What is the equation for the least square regression line where the independent or predicto dependent or response variable is systolic blood pressure?

Patient 23 is 39 years old and has a systolic blood pressure of 120 mm Hg. What is the residual?

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

What is the interpretation of the residual?