Jan 2, 2014 Boyle's Law examines the relationship between the volume of a gas and its pressure. ... Since the pressure is directly proportional to the mass of the can plus water, we can ... We calculate the values of 1p and then plot V vs.. Dana is finding the perimeter of different-sized squares. There is a proportional relationship between the side length of the square in inches,. x,.. Whole numbers will be easier to calculate and plot on a graph, however. Show Answer. Draw a graph to show