Book Maths Puzzle Algebra

How do I find y? The problem is: x-2y=0 (equation 1) 3x+y=0 (equation 2) Right now in my Algebra Honor class we're learning "Solving Systems by substitution" and at first I understood it but now I can't seem to get the answer I want. I don't know what to do so please help!

Anna "Haylea"

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