Question

if f:Q- Q be defined by f(x) =6x+7, Qis the set of Rationals. Find f^-1(y).​

Answer 1

Step-by-step explanation:

ANSWER

y=15x+7 is a linear function.

Since linear functions are bijective, ie. there is only one value of y corresponding to a single value of x, hence f(x) is bijective and invertible.

x=

15

y−7

Hence, option 'C' is correct.