Students working backstage constructing the set for the school play are required to build an archway. They decide to make it in the shape of a parabola with the equation y = ax^2 + bx + c . It is to stand in front of a building. Thex-axis represents the floor of the stage and all measurements are in metres.

i) Find the values of a, b and c by using simultaneous equations.

unsure how to do this. i can do it on my CAS calculator but dont know what to do here!