I have the understanding that you have all the theoretical knowledge related to your question. You are facing trouble in plotting zeros, poles and different system responses. The following code may help you:
numG = [2 0];
denG = [4 3 1];
denG(end+1) = 0;
You may refer to the following documentations for further information:
Please note the following:
There is no ramp command in MATLAB. However, as the ramp signal is one order higher than step signal, the step input signal can be used to obtain the ramp response by dividing the transfer function by s and then evaluating it using the step command. If the given transfer function of system is G(s), then the step command is used with the modified function G(s)/s to obtain the ramp response.
Hope that helps!