title: Plot the solution of a system of linear inequalities
body: <p>I have two arrays of numbers from [-1,1]: </p>
  
  <p><code>a = 2*np.random.sample(100)-1</code> and 
  <code>b = 2*np.random.sample(100)-1</code>. These two arrays define the following system of linear inequalities</p>
  
  <p>a[i]*x + b[i]*y &lt;= 1 for i = 0,1,..., 99</p>
  
  <p>The solution-set of this system is a convex polygon. How to draw it using matplotlib? As I understand,<code>fill_between</code> allows to do this only for case of two inequalities.</p>