Display the Formula in Worksheet

I have developed a table which contain different values of "a" and "b" for each columns cells. Constant "a" and "b" varies every_ time I run the macro.

Please see attachment. I like to display the equation "y= a+ bX" , " y = aX^b" ,"Y = a * e ^ (b * X)" automatically every time the macro generate the new "a" and "b" values .

"a" and " b" is going to be different for every run.

Please let me know If I have to provide more explanation for you.

Thanks

What I Mean , is that :

I like to display
y = -0.0376x + 261.5377 in cell "C9" (Y = a + b * X)
y = 54210.4130x^-0.7376 in cell "D9" (Y = a * X ^ b) and so for..

Thanks

hope that is clear