Question

if y = f(x) = x+1/x-1 , x≠1 , show that x=f(y)​

Answer 1

$f \: 2 = 2 + 1 \div 2 - 1 = 3 \\ f \: 3 = 3 + 1 \div 3 - 1 = 2 \\ f \: y = x \\ if \: x = 2 \\ y = 3$