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Question

Let ¯a,¯b be two noncollinear vectors. If A=(x+4y)¯a+(2x+y+1)¯b,
B=(y2x+2)¯a+(2x3y1)¯band3A=2B then (x,y) =

A
(1,2)
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B
(1,-2)
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C
(2,-1)
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D
(-2,-1)
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