title: How to plot multiples regressions in one graph
body: <p>I would like to plot multiple regressions in R in a single plot</p>
  <p>is there any easy way to do so?</p>
  <p>the regressions look like this and all use launches and twitter, the data that is changed is likes:</p>
  <pre><code>ModelKLikes0 &lt;- lm(launches  ~ Twitter + likes + Twitter*likes, data=data0)
  
  ModelKreplies0 &lt;- lm(launches  ~ Twitter + replies + Twitter*replies, data=data0)
  
  ModelKretweet0 &lt;- lm(launches  ~ Twitter + retweets + Twitter*retweets, data=data0)
  </code></pre>
  <p>all the variables are numerical</p>
  <p>If possible, i would also likes to add to the plot these regressions as well, US being launches within the US</p>
  <pre><code>USLikes0 &lt;- lm(US  ~ Twitter + likes + Twitter*likes, data=data0)
  </code></pre>