Let's try to solve on our own and then look at our options. We need to add, since it says sum, two polynomials.
It would look like:
(2x-5y)+(x+y)
Let's start with x.
2x+x=3x
Now y.
-5y+y=-4y
We need to put 3x and -4y together.
The expression would look like 3x-4y, which is A.
