a Find equations for the family of parabolas with the given description The family of parabolas with vertex at the origin and with directrixes y y 1 y 4 and y 8 Directrix No y 2 1 2 y 1 y 4 y 8 b Draw the graphs 10 9 8 7 6 5 4 Equation 3 2 1 10 9 8 7 6 5 4 3 2 1 1 2 1 2 3 4 5 6 7 8 9 10 Fill Graph Layers After you add an object to the graph you can use Graph Layers to view and edit its properties