Solve the system of equations using substitution.
A. x = -8, y = 7; x = -7, y = 8
or (-8, 7), (-7, 8)
B. x = -8, y = -7; x = -7, y = -8
or (-8, -7), (-7, -8)
C. x = 8, y = -7; x = 7, y = -8
or (8, -7), (7, -8)
D. x = 8, y = 7; x = -7, y = -8
or (8, 7), (-7, -8)
Answer: D
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