A baseball coach bought 4 bats and 7 balls for $68. The next day the coach bought 1 bat and 1 ball for $14. The following system of equations can be used to determine how much each item cost. PLEASE HELP FAS

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?