Solve the system by the substitution method.
A. (1, 0), (0, -1)
B. (-1, 0), (0, -1)
C. (1, 0), (0, 1)
D. (-1, 0), (0, 1)
Answer: C
Mathematics
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For a test question, a mathematics teacher wants to find two constants a and b such that the test item "Simplify 
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