Respuesta :

snog

Answer:

#1

Step-by-step explanation:

The associative property of addition states that we can "flip" two expressions that are being added. Therefore, our answer is the first one because it can be rewritten as 3x + (-7y) which then is equivalent to -7y + 3x.
The answer is one if you try plugging x in as a number and y as one for an example (1,0) where x is 1 and y is 0