help me on dis MACRO question its very urgent

User inputs N entries in column A and B corresponding to values X and Y of a liner function.
Write a macro to compute the Slope and Intercept. Macro to be linked to the button.
Please do not use inbuilt statistical / mathematical functions




M (Slope)
C (Intercept)

Equation (Y = MX + C) Y=mX+C


Please reply as soon as possible