title: Using in line r code as part of a R markdown header
body: <p>I wish to use in line R code as part of a header in a r markdown file. However when i knit the  file the fonts used on the header are different. How can I ensure the fonts are the same. A simple example is below. </p>
  
  <pre><code>`r 1+1`  Header 
  -------------------------
  </code></pre>