Here is a screenshot from the Casio Prizm, showing the graph of two inequalities, y>=x+1 and y<2x+3. The dark shaded area is the solution to both inequalities. The actual screen looks somewhat crisper than the screenshot.
Casio Prizm screenshot


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12182010, 10:27 PM
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12192010, 02:33 PM
What an improvement compared to what we can do with an HP48G:
Since I'm not that familiar with plotting I had to consult the manual. You need two different plottypes: TRUTH and CONS.
INEQ 'Y\>=X+1 AND Y<2*X+3'
EQNS { 'Y=X+1' 'Y=2*X+3' } Now you can choose one or the other for EQ. Don't ERASE the graph after drawing the first plot.
Currently I'm reading the fun of programming.
Checker
checker \<<
EQ \<< Y X checker \>>
Polar Checker
Make sure you have your calculator in RADmode.
toPolar \<< n = 10
EQ \<<
Swirl Vertical Strip
vstrip \<< ABS .5 \<= \>>
fromPolar \<< r = 1
EQ \<< Now this turns out to be very slow. Moreover I received an "Insufficent Memory" error and had to plot the image in several runs. Not exactly what you want. Still I hope these examples might be inspiring.
Best regards 