Find the solutions to the system of equations by the addition method.
x + 
y = 1
x - 
y = 3
A. (7, -4)
B. (-8, -3)
C. (7, -3)
D. (8, -4)
Answer: D
Mathematics
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and 
A. 
and 
B. 
and 
C. 
and 
D. 
and 
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A. 
B. 
C. 
D. 
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