Solve by the substitution method. x + y = 39x + 9y = 27
A. {(0, 0)}
B. {(7, -4)}
C. {(x, y)| x + y = 3}
D. ?
Answer: C
Mathematics
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A. 
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C. 
D. 
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A. 
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C. 
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A. 
+ 
i
B. - 
- 
i
C. - 
- 
i
D. 
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A. x2 + 
x - 
B. x2 + 
x + 
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D. x2 + 
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