title: R not drawing regression line
body: <p>So I'm trying to get a regression line to show up on the data plot, and it isn't working. I tried restarting R, checked the code, it looks totally fine to me. The abline() command worked for every other plot I've made today, just not this one.</p>
  
  <p>Here's the commands I used: </p>
  
  <pre><code>hw3c &lt;- read.csv(file.choose(), header = T)
  model.3c &lt;- lm(hw3c)
  plot(hw3c)
  abline(model.3c)
  </code></pre>
  
  <p>The data is:</p>
  
  <pre><code>Crab,Sal
  0.7,3
  1.7,3.2
  1.3,6.5
  2.2,6.5
  0.9,9.4
  3.2,23.4
  5,27.1
  </code></pre>
  
  <p>I know this is stupidly simple, I don't get why it isn't working. Help?</p>