A custom jobber of speciality fibreglass-bodied cars wished to estimate overhead expenses (labelled A and measured in $'000s) as a function of the number of cars (labelled B) produced monthly. A random sample of 10 months was recorded, and the following statistics were calculated: sample covariance of A and B (100), sample variance of A (10), sample variance of B (250), sample mean of A (5), and sample mean of B (10). Compute the least squares regression line. Show your work