Solve the system of equations using substitution.
A. x = 4, y = -5; x = 5, y = -4
or (4, -5), (5, -4)
B. x = -4, y = 5; x = -5, y = 4
or (-4, 5), (-5, 4)
C. x = -4, y = -5; x = 5, y = 4
or (-4, -5), (5, 4)
D. x = 4, y = 5; x = 5, y = 4
or (4, 5), (5, 4)
Answer: C
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