Determine which relations represent y as a function of x. (Select all that apply) $2x^2 + 3y = 5$ $6x + y = 7$ None of these $y = \frac{9x + 8}{6x + 6}$ $4y = \pm \sqrt{7 - 9x}$ $3x + 9y^2 = 7$ $x = \sqrt{9 - 5y^2}$
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