This activity should take about 15-20 minutes tops. Print off the attached pages and place students in small groups. Place copies of the graphs around the room. Students try to find and match ONE of each of the two graphs listed and write the words that are posted on that graph. If solved correctly, it will give the complete Valentine Riddle. (What did one light bulb say to the other? I love you a whole watt!) This includes slope-intercept form, standard form, etc.