Solve the system by the addition method.x2 - y2 = 9x2 + y2 = 51
A. {(
, 
), (-
, 
)}
B. {(
, 
), (-
, -
)}
C. {(0, 0)}
D. {(
, 
), (-
, 
), (
, -
), (-
, -
)}
Answer: D
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, -20, 0, 
, 
. Which are integers but not natural numbers?
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C. 19, 
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