If you want to describe a point you use coordinates (2,5), for lines you use functions: y=-3x+2, but what about whole "regions"?One way is to use "inequalities". An "inequal" function is one in which you define the y-coordinate as being "greater than: >", "greater than OR equal to: ", "less than: Watch the video below for a quick overview of the gameplay, then scroll down and start lasering some ghosts!