title: Rotate a line by a given angle
body: <p>Given the coefficients of a line A , B and C.</p>
  <pre><code>Ax + By + C = 0
  </code></pre>
  <p>I wish to rotate the line by angle say <strong>x</strong> in clockwise or ant-clockwise direction. How can I achieve this so that I get new coefficients then?(In NetLogo)</p>
  <p>EDIT:
  Sorry consider point as x_0 and y_0</p>