Solve the system of equations using substitution.
A. x = 4, y = 4; x = -1, y = 9
or (4, 4), (-1, 9)
B. x = 2, y = 6 or (2, 6)
C. x = 4, y = 12; x = -1, y = 9
or (4, 12), (-1, 9)
D. x = -4, y = 12; x = 1, y = 7
or (-4, 12), (1, 7)
Answer: A
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