Solve the system of equations using substitution.
A. x = 5, y = 10 or (5, 10)
B. x = 5, y = 10; x = 5, y = -10
or (5, 10), (5, -10)
C. x = 5, y = 10; x = -5, y = 0
or (5, 10), (-5, 0)
D. x = 5, y = 10; x = 5, y = -10; x = -5, y = 0
or (5, 10), (5, -10), (-5, 0)
Answer: A
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