A) $ 7x-3y $
B) $ 7x+3y $
C) $ 3x-7y $
D) $ 3x+7y $
Correct Answer: B
[b] Let $ 2x+3y=A $ and $ 2x-7y=B $ Then, $ 7A+3B=20x $
$ \therefore f(A,B)=7A+3B $
$ \therefore f(x,y)=7x+3y $
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