Mathematics core 3 inverse functions?

Question

For the following function f(x), sketch the graph of f(x) and f^-1(x) on the same set of axes.

Determine also the equation of f^-1(x).

a) f(x)=2x+3 {xER}
b) f(x)=x/2 {xER}
c) f(x)=1/x {xER, x(=/)}

Answer 1

In each case put y = f(x) and use basic algebra to rearrange the equation to read x = f(y) then this is the inverse function.

Answer 2

C3 Inverse Functions

Answer 3

huh............ im confuzzed already