Like the graphs for other equations, the graph of a hyperbola can be translated. If a hyperbola is translated
units horizontally and
units vertically, the center of the
hyperbola will be
This translation results in the standard form of the equation we saw previously, with
replaced by
and
replaced by
Standard forms of the equation of a hyperbola with center (
h ,
k )
The standard form of the equation of a hyperbola with center
and transverse axis parallel to the
x -axis is
where
the length of the transverse axis is
the coordinates of the vertices are
the length of the conjugate axis is
the coordinates of the co-vertices are
the distance between the foci is
where
the coordinates of the foci are
The asymptotes of the hyperbola coincide with the diagonals of the central rectangle. The length of the rectangle is
and its width is
The slopes of the diagonals are
and each diagonal passes through the center
Using the
point-slope formula , it is simple to show that the equations of the asymptotes are
See
[link]a
The standard form of the equation of a hyperbola with center
and transverse axis parallel to the
y -axis is
where
the length of the transverse axis is
the coordinates of the vertices are
the length of the conjugate axis is
the coordinates of the co-vertices are
the distance between the foci is
where
the coordinates of the foci are
Using the reasoning above, the equations of the asymptotes are
See
[link]b .
Like hyperbolas centered at the origin, hyperbolas centered at a point
have vertices, co-vertices, and foci that are related by the equation
We can use this relationship along with the midpoint and distance formulas to find the standard equation of a hyperbola when the vertices and foci are given.
Given the vertices and foci of a hyperbola centered at
write its equation in standard form.
Determine whether the transverse axis is parallel to the
x - or
y -axis.
If the
y -coordinates of the given vertices and foci are the same, then the transverse axis is parallel to the
x -axis. Use the standard form
If the
x -coordinates of the given vertices and foci are the same, then the transverse axis is parallel to the
y -axis. Use the standard form
Identify the center of the hyperbola,
using the midpoint formula and the given coordinates for the vertices.
Find
by solving for the length of the transverse axis,
, which is the distance between the given vertices.
Find
using
and
found in Step 2 along with the given coordinates for the foci.
Solve for
using the equation
Substitute the values for
and
into the standard form of the equation determined in Step 1.
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