Solve the system of equations by the substitution method. Check your solutions. For any dependent equations, write your answer in ordered pair form. x + y = 45x + 5y = 20
A. ?
B. {(0, 0)}
C. {(9, -5)}
D. {(x, 4 - x)}
Answer: D
Mathematics
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A. 
B. 
C. 
D. 
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