I can display linear equations within the graph using

Context("Numeric");

$a = random(3,9,1);

$x="x";

$ftex = "$a$x+1";

And then within the graph, provide:

$label4= new Label(3.2 , 2 , $ftex,'black',('center','center'));

$graph1 -> lb($label4);

(improvements welcome!)

But can not figure out how to get a formatted LaTeX expression to appear (specifically one involving symbols or letters such as \theta).

Thanks.