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B
7x+3y
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C
3x-7y
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D
x-4y
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Solution
The correct option is B 7x+3y Let2x+3y=mand2x−7y=n.then,m−n=10y⇒y=m−n10Puttingthisvalueofyin2x+3y=m,wegetx=7m+3n20⇒7m+3n=20xor,f(m,n)=7m+3nor,f(x,y)=7x+3y