title: Plot inequalities in R
body: <p>I have a problem in R and I would greatly appreciate your help. </p>
  
  <p>I have to plot the feasibility area for the following constrains:</p>
  
  <pre><code>constrains:
  5*x + 3*y &gt;=  210
  x + y &lt;= 110
  4*x + y &lt;= 200
  </code></pre>
  
  <p>Any ideas? Also i need to color the feasible are. </p>