Final answer:
Like terms are combined by adding their coefficients. The two sets of like terms in the given polynomials are -y² and -3y.
Step-by-step explanation:
Like terms are terms that have the same variable(s) and the same exponent(s) on the variable(s). When adding the polynomials -3y²-4y and 2y²+y, we can combine the like terms.
The like terms in the polynomials are:
- -3y² and 2y² - both terms have the variable y raised to the power of 2.
- -4y and y - both terms have the variable y raised to the power of 1.
When combining the like terms, we add their coefficients:
- The like terms -3y² and 2y² can be combined to give -3y² + 2y² = -y².
- The like terms -4y and y can be combined to give -4y + y = -3y.
So, the two sets of like terms are -y² and -3y.