How to plot differential equations?

I have a few differential equations with given values , and I want to plot these equation. What should I do to plot? Because I have typed the equations in matlab, but do i have to mention these equations again in order to do plotting?

here are my equations:

And assume N = 10^6, alpha = 0.1, beta = 0.3, gamma = 0.75, delta = 0.9, epsilon = 1.1, zeta = 10000.

[John D'Errico]

Do you have to mention them? Um, yes. You need to learn to use a differential equation solver. For this, it might be ODE45, as a start. If you read the help for that tool, it will give examples of use. I would suggest you try it for a SMALL, SIMPLE problem, one where you know the solution in advance. Then you will get an idea if you have used it properly.