Linear functions

Q. If for non-zero x, $2f\left(x\right)+3f\left(\frac{1}{x}\right)=\frac{1}{x}-5$, then the value of f(2) is

Q. If $f(2x+3y,2x-7y)=20x$, then $f(x,y)$ equals

1. 7x-3y
2. 7x+3y
3. 3x-7y
4. x-4y