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Aletocabens
The correct answer is letter C, 2y=26.

When you add both equations you get that answer.
Just solve vertically. 
So first add 3x and -3x, and they cancel out. So the terms with the x variables have been eliminated.
Then, add -y and 3y to get 2y on the left side of the equation.
Lastly, add -1 and 26 to get 26 on the other side (right side) of the equation.

So, in all, you have 2y=26 as the resulting equation, after you add them.

Thus, option C is the correct answer.

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