title: Maxima plot not working
body: <p>What am I doing wrong in this code?</p>
  
  <pre><code>atvalue(y(x),[x=0],1)$
  desolve(diff(y(x),x)=y(x),y(x));
  plot2d(y(x),[x,-6,6]);
  </code></pre>
  
  <p>Output:</p>
  
  <pre><code>plot2d: expression evaluates to non-numeric value everywhere in plotting range.
  plot2d: nothing to plot
  false
  </code></pre>
  
  <p>I want to plot y(x) which is obtained from a differential equation.</p>