A function f(x) contains the following points: (2.00, 0.90), (4.00, 3.00), (6.00, -4.50), (8.00, -3.00). (10.00, 4.00), (12.00, 2.20) The least-squares best fit 1st order polynomial (1) using the data at x = 2, x = 6, and x = 10, (2) rounded to 4 decimal places, and (3) doing the math by hand can be written in the form of y = ax + b. What is the value of b