Solve the system of equations by substitution.
A. x = -7, y = 7; (-7, 7)
B. x = -6, y = 6; (-6, 6)
C. x = 6, y = -6; (6, -6)
D. x = 7, y = -7; (7, -7)
Answer: D
Mathematics
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4
A. - 
+ 
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B. - 
- 
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- 
i
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