Solve the system of equations using substitution.
A. x = -3, y = -1; x = -1, y = -3; x = -3, y = 1; x = -1, y = 3
or (-3, -1), (-1, -3), (-3, 1), (-1, 3)
B. x = 3, y = 1; x = 1, y = 3; x = 3, y = -1; x = 1, y = -3
or (3, 1), (1, 3), (3, -1), (1, -3)
C. x = 3, y = -3; x = -3, y = -1; x = 1, y = 3; x = -1, y = -3
or (3, -3), (-3, -1), (1, 3), (-1, -3)
D. x = 3, y = 1; x = -3, y = -1; x = 3, y = -1; x = -3, y = 1
or (3, 1), (-3, -1), (3, -1), (-3, 1)
Answer: C
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