Solve the system of equations using substitution.
A. x = 9, y = 8; x = 8, y = 9
B. x = -9, y = 8; x = -8, y = 9
C. x = -9, y = -8; x = -8, y = -9
D. x = 9, y = -8; x = 8, y = -9
Answer: A
Mathematics
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A. y = 
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