Ex22 = EX22 [(EX2)2 / n]
 = 172.125 84.375
 = 87.750

 Zxlx2 = EX1X2 [(EX1)(X2) / n]
 = 60.75 33.75
 = 27.00

 Exly = ZX1Y [(XX1)(ZY) / n]
 = 61.875 57.000
 = 4.875

 Zx2y = EX2Y [(EX2)(ZY) / n]
 = 155.5875 142.5000
 = 13.0875

 Zy2 = Zy2 [(Zy)2 / n]
 = 243.9150 240.667
 = 3.2483


The desired function has the general form

 Y = a + blX1 + b2X2

The values of a, bl, and b2 must be found. First, find
the value that is normally called D:

 D = (Ex12) (~x22) (Exlx2)2
 = (9.0)(87.75) (27)2
 = 60.75

Then calculate b1 by the following equation:

 bl = [(Zx22)(Exly) (Exlx2)(Ex2Y)] / D

and b2 as follows:

 b2 = [(xl2) (Zx2y) (Zxlx2)(Exly)] / D