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