Interchange the variables.

Rewrite the equation as .

Subtract from both sides of the equation.

Multiply each term in by

Multiply each term in by .

Multiply .

Multiply by .

Multiply by .

Simplify each term.

Move to the left of .

Rewrite as .

Multiply by .

Replace the with to show the final answer.

Set up the composite result function.

Evaluate by substituting in the value of into .

Simplify each term.

Apply the distributive property.

Multiply by .

Multiply .

Multiply by .

Multiply by .

Combine the opposite terms in .

Add and .

Add and .

Since , is the inverse of .

Find the Inverse y=9-x