Solve using elimination.
A. x = 
, y = ; x = -
, y =
; x = ,
, y = - 
; x = - 
, y = - 
or (
, 
), (- 
, 
), (
, - 
), (- 
, - 
)
B. x = - 
, y = 
; x = - 
, y = - 
or (- 
, 
), (- 
, - 
)
C. x = 
, y = 
; x = - 
, y = 
; x = ,
, y = - 
; x = - 
, y = - 
or (
, 
), (- 
, 
), (
, - 
), (- 
, - 
)
D. x = 
, y = 
; x = ,
, y = - 
;
or (
, 
), (
, - 
)
Answer: A
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4
6
A. 
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B. 
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C. 
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