Which function is used to model overtime pay

In the coordinate plan (-6,9) b (3,9) c (3,3) def is shown in the coordinate plan below

What could explain what happened when the time was equal to 120 minutes

When the solutions to each of the two equations below are graphed in the xy-coordinate plane, the graphs of the solutions intersect at two places. write the y-cordninates of the points of intersection in the boxes below in order from smallest to largest. y=2x y=x^2-3