197Graphing a Conic Section 14 - 2• Conic section graphs can be drawn in blue only.• You cannot overwrite conic section graphs.• The calculator automatically clears the screen before drawing a new conicsection graph.• You can use trace, scroll, zoom, or sketch after graphing a conic section.However, a conic section graph cannot be scrolled while using trace.• You cannot incorporate graphing of a conic section into a program.x-intercept A’ x-intercept Ay-intercept B’y-intercept BFocus F’Focus FVertex ADirectrix lAxis of symmetryFocus F (p, 0)• A parabola is the locus of points equidistant from fixed line l and fixed point Fnot on the line. Fixed point F is the “focus,” fixed line l is the “directrix,” thehorizontal line that passes through the focus directrix is the “axis of symme-try,” the length of a straight line that intersects the parabola, passes throughthe locus, and is parallel to fixed line l is the “latus rectum,” and point A wherethe parabola intersects the axis of symmetry is the “vertex.”• An ellipse is the locus of points the sum of the distances of each of whichfrom two fixed points F and F’ is constant. Points F and F’ are the “foci,”points A, A’, B, and B’ where the ellipse intersects the x- and y-axes are the“vertexes,” the x-coordinate values of vertexes A and A’ are calledx-intercepts, and the y-coordinate values of vertexes B and B’ are calledy-intercepts.Latus rectumCFX
