A few weeks ago, I learned how to graph. The function of graphing a line is to know if it has an intersection or not. so we used 2 methods of graphing: manual and automatic. manual means we use pencil and ruler to graph on the paper while the automatic means we use program(s) in computer. and I know that graphing automatically is faster, but graphing manually is easier for me and graphing manually make us more patience and accurate.