The equation \( y = x \) means that for any value of \( x \), \( y \) will be the same as \( x \). Therefore, if the x-coordinate is 3, we can substitute it into the equation:
\[ y = 3 \]
Thus, the ordered pair that satisfies the equation when \( x = 3 \) is \( (3, 3) \).
The options you provided (A: 1, B: 6, C: 9, D: 12) do not directly correlate to the ordered pair \( (3, 3) \). However, the answer to the specific question regarding the ordered pair is \( (3, 3) \). If you need a corresponding value from your options, let me know!