How much of the circle is shaded 1/9 and 1/2

Monica build a remote control toy airplane for science project to test the plane she launched it from the top of a building the plane travel a horizontal distance of 50 feet before landing on the ground a quadratic function which models the height of the plane in feet relative to the ground at a horizontal distance of x feet from the building is shown

What term makes it inconsistent y=2x - 4

Solve 3x-18=2y and 5x-6y=6 by elimination show work