exam Maths Puzzle Numerical Ability

x+5y=28
-x-2y=-13

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exam Other Question

please help!! I have to add
3w^2-9w-1 and 8w^2-9w-4
Show this problem as the following properties.
6 * (5 + 4)

(a) Distributive property
(b) Commutative property of addition
(c) Commutative property of multiplication