title: How to stop axis from resizing
body: <p>I plotted a line with this code: </p>
  
  <pre><code>Manipulate[Plot[y = m (x - a) + b, {x, -10, 10}],
   {m, -10, 10}, {a, -10, 10}, {b, -10, 10}]
  </code></pre>
  
  <p>When I change the m (slope of the line) with the slider the axis get's re-sized and the line get's move up or down and finally flipped over but I want to see how the line rotates around without the axis moving and re-sizing. What should I do?</p>