Solve the system by the method of your choice. Identify systems with no solution and systems with infinitely many solutions, using set notation to express their solution sets.x - 7y = -2-3x + 21y = 6
A. {(0, 0)}
B. {(-2, 0)}
C. {(x, y) | x - 7y = -2}
D. ?
Answer: C
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