Solve the system of equations using substitution.
A. x = 9, y = 5; x = -9, y = -5; x = 9, y = -5; x = -9, y = 5
or (9, 5), (-9, -5), (9, -5), (-9, 5)
B. x = 9, y = -9; x = -9, y = -5; x = 5, y = 9; x = -5, y = -9
or (9, -9), (-9, -5), (5, 9), (-5, -9)
C. x = 9, y = 5; x = 5, y = 9; x = 9, y = -5; x = 5, y = -9
or (9, 5), (5, 9), (9, -5), (5, -9)
D. x = -9, y = -5; x = -5, y = -9; x = -9, y = 5; x = -5, y = 9
or (-9, -5), (-5, -9), (-9, 5), (-5, 9)
Answer: B
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