If the​ x- and​ y-values in a​ one-to-many relation are​ reversed, then in the resulting relation ▼ at most one every exactly one at least one ▼ input output value maps to ▼ exactly at least more than no more than one ▼ input output value. This means the resulting relation ▼ be a function.

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?