[LON-CAPA-users] Evaluation of variable in tex mode

[H. K. Ng]

When printing the script below, the symbol $x$ is replaced with the value 
of $x. So if $x = 4, it displays the following:

...along the 4$-axis from 0 to 4.

whereas it should be

...along the x-axis from 0 to 4.

(with the letter x slanted).
Question: How can I use the same "name" in the display and as a variable?
Thanks,
-hk

====================================
<script type="loncapa/perl">
$x=&random(3,10,0.5);
</script>

<startouttext />
A particle moves along the <display>&tex('$x$','x')</display>-axis from 0 
to $x.
<endouttext />