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Question

If f(2x+3y,2x7y)=20x, then f(x,y) equals

A
7x-3y
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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
Let 2x+3y=m and 2x7y=n. then, mn=10yy=mn10Putting this value of y in 2x+3y=m,we getx=7m+3n207m+3n=20xor, f(m,n)=7m+3nor, f(x,y)=7x+3y

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