y(n) = a * y(n-1) + K * b * x(n-1) + K * x(n), where |a| < 1. (a) Calculate its impulse response, h(n). the homogenous equation is l^n-1(l-a) = 0 => 1 = a so h(n) = [ka^n ] u(n) (b) Calculate its step response. I can't seem to find any examples online and my book says nothing about step responses. I am not sure where to start.