PLEASE HELP 10 POINTS +

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

How do i solve uniform motion problems?

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?