Find A-1 then use it to find the solution to the system.
A. A-1 = 
; x = 21, y = -70
B. A-1 = 
; x = -21, y = 10
C. A-1 = 
, x = -42, y = -140
D. A-1 = 
; x = -105, y = 70
Answer: B
Mathematics
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