SOLUTION: 2+9=

SOLUTION: 2+9=_ +2

Question 668690: 2+9=_ +2
Answer by swincher4391(1107) (Show Source): You can put this solution on YOUR website!
We know in general for x,y if we have x+y that's equal to y+x. This is what we call the commutative property of addition. So, where x =2 and y =9, we have:
x + y = y + x
2 + 9 = 9 + 2
So, the missing number is 9.
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