Solve the system of equations using substitution.
A. x = 5, y = -5; x = -5, y = -6; x = 6, y = 5; x = -6, y = -5
or (5, -5), (-5, -6), (6, 5), (-6, -5)
B. x = 5, y = 6; x = 6, y = 5; x = 5, y = -6; x = 6, y = -5
or (5, 6), (6, 5), (5, -6), (6, -5)
C. x = 5, y = 6; x = -5, y = -6; x = 5, y = -6; x = -5, y = 6
or (5, 6), (-5, -6), (5, -6), (-5, 6)
D. x = -5, y = -6; x = -6, y = -5; x = -5, y = 6; x = -6, y = 5
or (-5, -6), (-6, -5), (-5, 6), (-6, 5)
Answer: A
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