>How do u graph vertical lines You can draw vertical lines with one of the Draw commands, to actually graph it, read this: http://rhf.bradley.edu/~rkremer/tifaq.htm#11.4 >and how do u shade in between lines ilike if u >have y<=2x+4 and u have y=-4x+5. how can u graph in between. Use the Shade command, read this: http://rhf.bradley.edu/~rkremer/tifaq.htm#11.1