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• Implicit function graphs can be drawn in blue only.

• You cannot overwrite implicit function graphs.

• The calculator automatically clears the screen before drawing a new implicit

function graph.

• You can use trace, scroll, zoom, or sketch after graphing an implicit function.

However, an implicit function graph cannot be scrolled while using trace.

• You cannot incorporate graphing of an implicit function into a program.

• A parabola is the locus of points equidistant from fixed line

not on the line. Fixed point F is the "focus," fixed line

horizontal line that passes through the focus directrix is the "axis of symme-

try," the length of a straight line that intersects the parabola, passes through

the locus, and is parallel to fixed line

where the parabola intersects the axis of symmetry is the "vertex."

Latus rectum

Axis of symmetry

• An ellipse is the locus of points the sum of the distances of each of which

from 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 called x-

intercepts, and the y-coordinate values of vertexes B and B' are called y-

intercepts.

-intercept A'

Graphing an Implicit Function

is the "latus rectum," and point A

Directrix

Vertex A

Focus F (p, 0)

-intercept B

Focus F'

-intercept B'

and fixed point F

is the "directrix," the

-intercept A

Focus F

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