4 because each corner has 1
By Cramer's rule, the solution can be found as the ratio of determinants. The numerator is the matrix with the right-side constants replacing the coefficients of the variable of interest. The denominator is the matrix of coefficients.
The solution is ...
... B. (1, 4)
x y x^2 xy
2 100 4 200
4 83 16 332
6 50 36 300
8 35 64 280
10 23 100 230
∑x = 30; ∑y = 291; ∑x^2 = 220; ∑xy = 1,342; n = 5
The <span>least squares regression line equation is given by y = bx + a = -10.1x + 118.9.</span>