The "6" in 16 MUST be a result of being multiplied by 2: the coefficient on x, hence: , or 3: the value of x. 

With x being 3, we get:

2(3) + 5y = 16

6 + 5y = 16

5y = 16 - 6

5y = 10______y = , or 2

With x = 3, and y = 2,  

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