Answer:He bought 9 cans.
Step-by-step explanation:
27divided by 3 is 9.
If you know that y = 6. You just have to switch Y by 6.
x + 2y = 16
x + 2*6 = 16
x + 12 = 16
x = 16 - 12
x= 4
4 + 2*6 = 16
Hope this helps !
Photon
Well you would move the order around to 13+7+29 and that would be the commutative property