To find an inverse function we have to switch the x to y, and y to x. If the numbers are subtracted or added, you can put the numbers next to each other and switch the +/-. If there's a number in front of the x, we have to divide it on both sides so it will be equal.
To verify if two functions are inverse of each others we have to use one of them to find the inverse function.
Example when the inverse of a function is not a function:
To verify if two functions are inverse of each others we have to use one of them to find the inverse function.
Example when the inverse of a function is not a function: