The differences between the data points and the estimated regression line are called the

Linear regression is a method of finding the linear equation that comes closest to fitting a collection of data points.
The better the choice of line, the closer the predicted values will be to the observed values.
The differences between the data pints (observed values) and the estimated (pedicted) regression line is called  the residue.
Residue = Observed Value - Predicted Value

Add them all together then u will get your answer