Solve the system by the addition method. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. {(5, -3)}
B. {(0, 12)}
C. no solution; ?
D. infinitely many solutions; {
3x + y = 12} or {
9x + 3y = 36}
Answer: D
Mathematics
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