Solve the system of equations using substitution.
A. x = -3, y = 4; x = -4, y = 3
or (-3, 4), (-4, 3)
B. x = 3, y = -4; x = 4, y = -3
or (3, -4), (4, -3)
C. x = -3, y = -4; x = -4, y = -3
or (-3, -4), (-4, -3)
D. x = 3, y = 4; x = 4, y = 3
or (3, 4), (4, 3)
Answer: C
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