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Write the equation of the hyperbola centered at `(9 , 1 )`. The length of the horizontal transverse axis is 18 and the length of the conjugate axis is 8.
Box 1: Enter your answer as an equation. Example: y=3x^2+1, 2+x+y=3
Be sure your variables match those in the question
`(x-9)^2/81 - (y-1)^2/16 = 1`