An archway is modeled by the equation y = -2x2 + 8x. a rod is to be placed across the archway at an angle defined by the equation x − 2.23y + 10.34 = 0. if the rod is attached to the archway at points a and b, such that point b is at a higher level than point a, at what distance from the ground level is point b? a.8 units b.6 units c.5 units d.3 units