(1\3)y2+12=5x Where X=3 Show Steps To Get Answer?

(1/3)y² + 12 = 5x for x=3
(1/3)y² + 12 = 5*3 = 15    (substitute 3 for x, evaluate)
(1/3)y² = 3    (subtract 12 from both sides of the equation)
y² = 9    (multiply both sides of the equation by 3)
y = ±√9    (take the square root of both sides)
y = ±3    (evaluate the square root)