9514 1404 393
Answer:
D. Multiply the second equation by 3. The solution is x = 12, y = 10.
Explanation:
In order to cancel the +3y term in the first equation, the second equation's y-term (-y) must be multiplied by a value that makes it be -3y. The second equation must be multiplied by 3.
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That answer choice also has the correct values for the solutions to x and y.