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Omni-MATH / Suppose that x and y are real numbers that satisfy the two equations: x²+3xy+y²=909 and 3x²+xy+3y²=1287. What is a possible value for x+y?

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Suppose that xx and yy are real numbers that satisfy the two equations: x2+3xy+y2=909x^{2} + 3xy + y^{2} = 909 and 3x2+xy+3y2=12873x^{2} + xy + 3y^{2} = 1287. What is a possible value for x+yx+y?
Plain-text mathematical notation (without MathML)
Suppose that x and y are real numbers that satisfy the two equations: x²+3xy+y²=909 and 3x²+xy+3y²=1287. What is a possible value for x+y?
Original LaTeX notation
Suppose that $x$ and $y$ are real numbers that satisfy the two equations: $x^{2} + 3xy + y^{2} = 909$ and $3x^{2} + xy + 3y^{2} = 1287$. What is a possible value for $x+y$?

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