A mathematics teacher recorded the length of time (y) minutes , taken to travel to school when leaving x minutes after 7 am on seven selected mornings. the result are as follows. find the least square regression line of y on x.

x 0 10 20 30 40 50 60

y 16 27 28 39 39 48 51

1 ) show the steps wise procedure and fond the regression line y on x

2)Also comment on if the teacher leaves 70 minits after 7 am then how many minutes will she take to reach to the school ? show the calculation