For a school band fundraiser, students are selling seat cushions for $4 each and license plate holders for $6 each. One student raises $304. Write an equation in standard form of the line that models the possible combinations of seat cushions and license plate holders the student sold. List two of these possible combinations. Write an equation of the line that passes through the point (4, 7) and is (a) parallel to and (b) perpendicular to the line y =x- 1.