title: Plotting a y=mx+c graph in python
body: <p>I currently have an equation <strong>Tn/v=P*Rn</strong>, but for ease's sake lets say it's y=mx.</p>
  
  <p>How would I go about plotting this using python if I wanted to calculate 'm' as a gradient.
  I already know the y value and the x value, how could I get this plotted and then find the gradient?</p>
  
  <p>I am currently using 'matplotlib' as the external library.</p>