Find the domain and range.{(9,-7), (-9,7), (1,-1), (1,4)}
A. domain = {-9, 1, 9, -1}; range = {7, -1, -7, 4}
B. domain = {-9, 1, 9}; range = {7, -1, -7, 4}
C. domain = {-9, 1, 9, 11}; range = {7, -1, -7, 4}
D. domain = {7, -1, -7, 4}; range = {-9, 1, 9}
Answer: B
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