In a survey of sales persons performance in a company, the number of telephone calls (x) each individual made to clients in a month and the number of computers (y) sold, were recorded for each of 8 sales persons. The results are presented in the following table. 

Compute the least-squares regression line for predicting a number of sales() from telephone calls made (x).

10 15 20 25 8. 11 19 21 2.