Plot a point for some of the ordered pairs from the example Company A: (5,15), (10,30), (25,75) problem shown at the right. Model the relationships by Company B: (5, 20), (10,35), (25, 80) drawing a line from the y-axis through each point. Explain how the graphs show which relationship is proportional and which is not proportional. 80 70 60 50 Cost (5) 40 30 20 10 O 10 20 30 Number of Mugs