Request PDF | Pairing theorems about parabolas through duality | We investigate the pairing of theorems about parabolas through a dual transformation. Parabola Focus and Directrix 1 pcmech.com - How to make a PDF without using any Adobe products. It's easy when you know how. Find the coordinates of the vertex, focus, the equation of the directrix and the axis of the parabola 2. 4. 4. 3 0 y x y. +. +. - = . (7). 18. a). Determine the vertex, focus, directrix, and the axis of symmetry of the given parabolas with the following standard equations. PDF. Forma Quadrática Representação matricial ime.unicamp.br/~deleo/MA327/ld5.pdf Let F(h.k) be the focus and y=mx+c the directrix.Find the vertex, value of p, axis of symmetry, focus, and directrix of each parabola, and then graph. 6. ( 1)2 = 8. 7. ( + 1)