please note I need the explanation( but not using excel ***) , thanks in advance

Problem 2 (2 points). A supermarket chain performed a survey to help determine desirable locations for its new stores. The management of the chain wanted to know whether a linear relationship exists between weekly take-home pay (x) and weekly food expenditures (y). A random sample of eight households produced the data shown in the following table Household 1 2 3 4 5 6 7 8 X 550 450 560 340 510 710 470 660 y 170 100 160 80 120 190 140 140 a/ Find the least square regression line. b/ Perform the test Ho: B1 = 0, HA: B1 # 0 (using a = 0.05) to determine whether there is enough evidence to infer that a linear relationship exists between weekly take-home pay (x) and weekly food expenditures (y)