math
posted by stephanie .
Which equation demonstrates the commutative property of addition?
a. 2x+y=y+2x
b. 2x+y=2x+y
c. 2x+y=2(x+y)
d. 2x+y=y+(2+x)

http://www.mathematicsdictionary.com/english/vmd/full/c/mutativepropertyofaddition.htm
I'll be glad to check your answer. 
A is the answer

Right.
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