Substitute the value of X into the equation. (1/3)y2 + 12 = 15, (1/3)y2 = 15 - 12, (1/3)y2 = 3, (multiply 1/3 by y2) y2/3 = 3/1, (now cross multiply) y2 *1 = 3*3, y2 = 9, y = 9/2, y = 4.5

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