Answer:
If y^2 + 18 = 27, we can solve for y as follows:
y^2 + 18 = 27
Subtracting 18 from both sides, we get:
y^2 = 9
Taking the square root of both sides, we get:
y = ±3
Since we are looking for the positive value of y, we can discard the negative solution and conclude that the positive value of y is:
y = 3.