Solve the system of equations using substitution.
A. x = 2, y = 7; x = 7, y = 2; x = 2, y = -7; x = 7, y = -2
or (2, 7), (7, 2), (2, -7), (7, -2)
B. x = 2, y = 7; x = -2, y = -7; x = 2, y = -7; x = -2, y = 7
or (2, 7), (-2, -7), (2, -7), (-2, 7)
C. x = -2, y = -7; x = -7, y = -2; x = -2, y = 7; x = -7, y = 2
or (-2, -7), (-7, -2), (-2, 7), (-7, 2)
D. x = 2, y = -2; x = -2, y = -7; x = 7, y = 2; x = -7, y = -2
or (2, -2), (-2, -7), (7, 2), (-7, -2)
Answer: D
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E. 
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