Solve the system of equations using substitution.
A. x = 10, y = 2; x = 2, y =10
B. x = 6, y = 3; x = 3, y = 6
C. x = 20, y = 1; x = 1, y = 20
D. x = 5, y = 4; x = 4, y = 5
Answer: D
Mathematics
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