Casio CFX-9970G User Manual page 218

• 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.
x
-intercept A'
Graphing an Implicit Function
l
is the "latus rectum," and point A
l
Directrix
Vertex A
Focus F (p, 0)
y
-intercept B
Focus F'
y
-intercept B'
l
and fixed point F
l
is the "directrix," the
x
-intercept A
Focus F
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