Find the frequency response for the following system:

9) y(n)+ay(n−1)=x(n)+x(n−1)+x(n−3)

Use the Fourier transform to find the output y(n) when the input is x(n)=(.5)ⁿu(n) for the following system:

2) h(n)=δ(n−1) + δ(n−2)