Solve the system of equations using substitution.
A. x = 2, y = -1; x = -2, y = -1
or (2, -1), (-2, -1)
B. x = 1, y = 2; x = -1, y = 2
or (1, 2), (-1, 2)
C. x = 2, y = -1; x = 1, y = 2; x = -1, y = 2; x = -2, y = -1
or (2, -1), (1, 2), (-1, 2), (-2, -1)
D. x = 1, y = 4; x = 4, y = 19
or (1, 4), (4, 19)
Answer: C
Mathematics
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