Solve using elimination.
A. x = 
, y = 
; x = ,
, y = - 
;
or (
, 
), (
, - 
)
B. x = 
, y = 
; x = - 
, y = 
; x = ,
, y = - 
; x = - 
, y = - 
or (
, 
), (- 
, 
), (
, - 
), (- 
, - 
)
C. x = 
, y = 
; x = - 
, y = 
; x = ,
, y = - 
; x = - 
, y = - 
or (
, 
), (- 
, 
), (
, - 
), (- 
, - 
)
D. x = - 
, y = 
; x = - 
, y = - 
or (- 
, 
), (- 
, - 
)
Answer: B
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A competing electronics manufacturer's revenue for selling a similar mobile phone is 
Under what circumstances will both manufacturers make the same revenue?
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A. 0
B. ?
C. 
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