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Write the equation of the ellipse `9 x^2 + 4 y^2 + 54 x -16 y + 61 = 0` in standard form

`(x-h)^2/a^2 + (y-k)^2/b^2 = 1`,
where:
h =
k =
a =
b =

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   x  x  √  n√  |   | (   ) π ∞ DNE
   x  √  (   ) π ∞ DNE
( ) ( ] [ ) [ ] —∞ ∞ ∪ DNE
< > ≤ ≥ or All Real Numbers DNE
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