Yes there is a way to graph the inequality x>0 as well as all other inequalities. Go to your scratchpad or document on your ti nspire cas. Press the blue ctrl button and then the menu button. Select option:4 Text, and then type the inequality x>0 or any other inequalities you may have. Press enter and then use the touchpad to grab and drag the inequality closer to the x or y axis. This will graph your inequality.
If you have any other questions feel free to let me know.