How do scientists use graphs? This concept comparison helps students contrast bar graphs, pie charts and line graphs created from categorical and numerical data. The recall device uses DRY MIX and TRAILS as acronyms to help Ss remember how variables are plotted on a graph, and standard format for a graph. The frame comparison helps students contrast rate of change, slope shape and written relationships of functions (y vs. x; y vs. x^2; y vs. 1/x, and so on). THREE (3) activities are included:ha