2.3/2.4 representing slope in proportional relationships

Thelime contains the point(-3,0) and parallel x-3y=3( show all work)

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?

Which is the focus of a parabola with equation y2=4x