Hello.
Firstly, let's isolate x on the equation:

Now, we can replace 'x' for 'y' and vice-versa:

Hope I helped.
Answer:
see the picture
Step-by-step explanation:
attached
Given the sum:

The sum is given below:
Therefore, the sum of the polynomials is:
Answer: 10.00
Step-by-step explanation:
You had to multiply and divide and see what you get.