Let f be the function defined by f(x) = lnx/x. what is the absolute value of f?

How do you use the elimination method for this question? explain, because i really want to understand!

Solve each quadratic equation by factoring and using the zero product property. 14x - 49 = x^2

1. ∠1 is complementary to ∠2 and ∠3 is complementary to ∠2. subtraction property of equality 2. m∠1 + m∠2 = 90 and m∠3 + m∠2 = 90 substitution 3. m∠1 + m∠2 = m∠3 + m∠2 definition of complementary 4. m∠1 = m∠3 given