title: Add line/equation to scatter plot
body: <p>I have 3 models, all of which are significant and I want to create a linear graph with my data. This is what I have so far:</p>
  
  <pre><code>&gt;morpho&lt;-read.table("C:\\Users\\Jess\\Dropbox\\Monochamus\\Morphometrics.csv",header=T,sep=",")
  &gt; attach(morpho)
  &gt; wtpro&lt;-lm(weight~pronotum)
  &gt; plot(weight,pronotum)
  &gt; abline(wtpro)
  </code></pre>
  
  <p>I have tried entering the abline as:</p>
  
  <pre><code>abline(lm(weight~pronotum))
  </code></pre>
  
  <p>I can't figure out what I'm doing wrong.  I want to add my equation, I have all of my coefficients but can't get past the line...I have even started over thinking maybe I messed up along the way and it still will not work.  Is there a separate package that I am missing?</p>