Question:
Find the largest value of $\frac{y}{x}$ for pairs of real numbers $(x,y)$ that satisfy
\[(x - 3)^2 + (y - 3)^2 = 6.\]

Answer:
Let $k = \frac{y}{x}.$  Then $y = kx,$ so
\[(x - 3)^2 + (kx - 3)^2 = 6.\]Expressing this as a quadratic in $x,$ we get
\[(k^2 + 1) x^2 - (6k + 6) k + 12 = 0.\]This quadratic has real roots when its discriminant is nonnegative:
\[(6k + 6)^2 - 4(k^2 + 1)(12) \ge 0.\]This simplifies to $k^2 - 6k + 1 \le 0.$  The roots of the corresponding equation $k^2 - 6k + 1 = 0$ are
\[3 \pm 2 \sqrt{2},\]so the solution to $k^2 - 6k + 1 \le 0$ is $3 - 2 \sqrt{2} \le k \le 3 + 2 \sqrt{2}.$

Therefore, the largest possible value of $k = \frac{y}{x}$ is $\boxed{3 + 2 \sqrt{2}}.$