title: least squares equation for a vertical line
body: <p>Given the following 2d points:</p>
  
  <p>213 106.8</p>
  
  <p>214 189</p>
  
  <p>214 293.4</p>
  
  <p>213 324</p>
  
  <p>223 414</p>
  
  <p>I want to find an equation for the least squares vertical axis line that runs through them. My plan is to get a line equation so I can test subsequent points for their distances to that least squares line.</p>
  
  <p>Thanks</p>