title: Adding benchmark lines to trend lines in Microsoft Excel
body: <p>I created a chart with speed over time. I then added two trendlines using Excel.</p>
  <p><strong>I would like to include a benchmark line - so in this case based on the trendlines - when does the speed reach 85%.</strong></p>
  <p>I did this by adding lines -to the chart (highligted in yellow) but wondering if there's a more accurate way to do this. At the moment I'm eye-balling the mark and moving my mouse to get to 85% line...</p>
  <p><a href="https://i.stack.imgur.com/64Hyo.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/64Hyo.png" alt="example chart " /></a></p>