x and y are the variables.
m = The slope of the regression line
a = The intercept point of the regression line and the y axis.
N = Number of values or elements
X = First Data Set
Y = Second Data Set
Î£XY = Sum of the Product of First and Second Data Set
Î£Xm = Mean of First (X) Data Set
Î£Ym = Sum of Second (Y) Data Set
Î£X2 = Sum of Square of First (X) Data Set Values