Which equation represents the relation that is shown in the graph? Cost of Buying Comic Books On a coordinate plane, a graph titled Cost of Buying Comic Books has number of issues on the x-axis and total cost on the y-axis. A line goes through points (0, 0), (1, 3.5), (2, 7). y = x + StartFraction 2 over 7 EndFraction y = x + StartFraction 7 over 2 EndFraction y = StartFraction 2 over 7 EndFraction x y = StartFraction 7 over 2 EndFraction x