HAART (Highly Active Antiretroviral Therapy) is a treatment for HIV infection. The concentration of HIV in the blood (in units of log10 copies/mL) was measured in 15 patients prior to HAART treatment. Then, the concentration of HIV in the blood (in units of log10 copies/mL) was measured in the same 15 patients after six months of HAART treatment. The HAART data give "before" and "after" measurements for each of 15 individuals. We can tabulate these data as follows. Before After Before 3.6 7.2 7.4 5.1 2.6 3.5 6.9 3.4 4.7 7.2 3.6 4.7 1.4 0.8 9.3 4.3 2.1 4.5 5.1 2.6 6.0 2.9 1.4 Calculate the least-squares line for the data set. (Round all numerical values to four decimal places.) y = After 3.6 1.7 2.3 2.4 4.7 2.3 3.0