Question 875687
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Hi
x	y     (x-4.25)   (y-12.75)    Product (  x-4.25)^2
2	7	-2.25	-5.75	12.9375	5.0625
4	11	-0.25	-1.75	0.4375	0.0625
5	13	0.75	0.25	0.1875	0.5625
6	20	1.75	7.25	12.6875	3.0625
17	51	0	0	26.25	8.75
4.25	12.75				

y = ax + b
a = 26.25/8.75 = 3
b = {{{m[y] - a*m[x]}}}
b = 12.75 - 3(4.25) = 0
y = 3x is the Regression Line
0r Use Excel
  *[illustration RG_20].