The hyperbola equation is .

                   (Divide each side by 18)

Compare it with .

.

Center : (h, k ) = (0, 0),

Vertices : (0, a) and (0, a) = .

         (Substitute : )

Foci : (0, c) and (0, c) =

Asymptotes of hyperbola are :  .

       (Substitute : h = 0, k =0 ,)

Graph of hyperbola:

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• Draw the coordinate plane.
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• Plot the center of hyperbola (0, 0).
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• To graph the hyperbola go units up and down from center point and units left and right from center point.
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• Use these points to draw a rectangle .
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• Draw diagonal lines through the center and the corner of the rectangle. These are asymptotes.
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• The graph approaches the asymptotes but never actually touches them.
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• Draw the curves, beginning at each vertex separately, that hug the asymptotes the farther away from the vertices the curve gets.
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• Plot the vertices and foci of hyperbola.
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The center of the hyperbola is (0, 0), vertices are , foci are ,

asymptotes of the hyperbola are , and the graph is shown below :