5. Consider a causal LTI system described by the difference equation y[n] + ½±y[n − 1] = x[n]. a. Determine the frequency response H(ej") of this system. b. What is the response of the system to the following inputs? i x[n] = (-)" u[n] - ii x[n] = d[n] + ½ɗ[n − 1]