HELP PLEASE I WILL MARK BRAINLIEST

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

Solve x+3y=6 and 4x-6y=6 by elimination . show work !

In the diagram of circle o, what is the measure of zabc?