(3x2+xy-5y2) + (2x2-xy+3y2)
Dh

5x² - 2y²

Step-by-step explanation:

(3x² + xy - 5y²) + (2x² - xy + 3y²)

since you are adding these polynomials, you can remove the parentheses without changing any signs

3x² + xy - 5y² + 2x² - xy + 3y²

align like terms next to each other

3x² + 2x² - 5y² + 3y² + xy - xy

combine like terms

5x² - 2y²

this linear equation would have just one solution.

step-by-step explanation:

the reason why this would have one solution is that it is an expression with just one variable. since that variable is not raised to a power, it will always have just one solution.

i'm assuming that it's c.)   volcanoes built the mountains and earthquakes tore them down.