Undefined as the line is parallel to y axis ie; x=3
Answer:
the x means 9
Step-by-step explanation:

above is the distance formula, plugging your numbers from P(x1,y1) and Q(x2,y2).

or
The difference between 1/2 and 1/6 is 2/6. So to write an expression we could do x divided by 2/6=2/3. So instead of a division expression, we could make that into a multiplication problem 2/6 times 2/3=x. 2/6 times 2/3= 4/18 so your answer is 4/18 or 2/9