Answer:

Explanation:
We can use the definition of inverse functions. Recall that if two functions, f and g are inverses, then:

So, we can let j be the inverse function of h.
Function h is given by:

Find its inverse. Flip variables:

Solve for y. Add:

Hence:

Therefore, a = 1/3 and b = 2/3.
We can verify our solution:

And:
