Ab^x +4 see if I found the correct equation...

have a graph with horizontal asymptote 4 with points (0,3) and (2,0) the equation needs to look like f(x) ab^x+4 picture of how I did it... for the a I got -1 and for the b I got 4 and x stays the same +4
so y = -1(4)^x +4

http://imageshack.us/photo/my-images/263…

y = -(2^x) + 4