Question 111762
Let f(x)= y = 2x+5 

a) To find f^-1, first solve the above equation for x like this:
y - 5 = 2x
{{{(y - 5)/2}}} = x

Then label the y variable x and call the x variable f^-1 like this:

{{{(x - 5)/2}}} = f^-1

b) 1/f(x)= {{{1/(2x+5)}}}