Graph this: y = x^2 + x + 1
Then turn your calculator 1/4 turn clockwise. :-)
You can solve for y, but you may not be happy with the results. You should get TWO different pieces. It is not a "function", so it takes a bit more effort.
I'd just turn the calculator. Don't you think your classmates would get a hoot out of it? Maybe your teacher has a sense of humor? It demonstrates a knowledge of reflection across the line x = y. Don't you want to be the first on in your class to claim that knowledge?