Final answer:
To add the given polynomials, combine the like terms and arrange them in descending order of the exponents.
Step-by-step explanation:
To add the given polynomials, we simply combine the like terms (terms with the same variables and exponents) and arrange them in descending order of the exponents.
The sum of the polynomials is: -4x^4y + 5 - 2xy^4 - x^2y^3 + x^5 - 6x^4y + 3xy^4 + x^2y^3
Combining the like terms, we get: x^5 - 10x^4y + xy^4 + y^4