Question

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Answer 1

11. It is distributive property.
12. y= -2
13. Commutative property of addition.


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Answer 2

Answer:(11) = Distributive property

            (12) = 5y+9=5+3y

                 =5y-3y=5-9

                 =2y=-4

                =y=-4/2

                =y=-2

          (13)= commutative property