Impulse response and step response Please help

How do you find impulse response and step response for the function

y(n) = (3/5)^(n)y(n-1) + x(n) for 0<n<20 discrete

This is what i have, can someone help me for n=0:20;

imp = [1; zeros(20,1)]; step = 1;

b = 1;

a = [1 -0.6*exp(n)];

h = filter(b,a,imp);

m = filter(b,a,step);

plot(n,h);

plot(n,m);

end

Answer 1

[Abhishek Ballaney]

https://in.mathworks.com/help/control/ref/impulse.html

https://in.mathworks.com/help/control/ref/step.html