Solve the system by the substitution method.
A. (9, 10), (10, 9)
B. (-9, -10), (10, 9)
C. (-9, 10), (-10, 9)
D. (9, -10), (10, -9)
Answer: B
Mathematics
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A. , -
B. - ,
C. - , -
D. -
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A.
B.
C.
D.
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