(0,5) and (4,3125)
I know we use y=ab^x but my mind goes blank after that.
Yep.....you have the correct function
Note, when x = 0, y = 5....so we have
5 = ab^(0) = a
So, since b^(0) = 1, then.....a = 5
And we know that
3125 = 5b^(4) divide both sides by 5
625 = b^4 take the 4th root of both sdes and we have
625^(1/4) = b = 5
So.....our function is
y = 5*5^(x)