Write a linear (y=mx+b), quadratic (y=ax2), or exponential (y=a(b)x) function that models the data. Help pls!!!!

[tex]1\to-9\\2\to-27\\3\to-81\\4\to-243\\5\to-729\\\\1\to-3(3)^1=-3(3)=-9\\2\to-3(3)^2=-3(9)=-27\\3\to-3(3)^3=-3(27)=-81\\4\to-3(3)^4=-3(81)=-243\\5\to-3(3)^5=-3(243)=-729\\\\Answer:\boxed{y=-3(3)^x}[/tex]