The graph below represents the price of sending video messages using the services of a phone company. what is the constant of proportionality? a graph is shown. the values on the x axis are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. the values on the y axis are 0, 24, 48, 72, 96, 120, 144, 168, 192, 216, 240. points are shown on ordered pairs 0, 0 and 2, 48 and 4, 96 and 6, 144 and 8, 192. these points are connected by a line. the label on the x axis is video messages sent. the label on the y axis is price in cents. 12 24 46 48