A) (1, -1)
B) (-1, 1)
C) (-1, -1)
D) (1, 1)
Correct Answer: B
Centre is given by $ ( \frac{hf-bg}{ab-h^{2}},\frac{gh-af}{ab-h^{2}} )=( \frac{+16.9}{-9.16},\frac{-9(16)}{-9(16)} )=(-1,1) $ .
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